Reze/History

History
Reze was one of many children taken by the USSR and placed in a special government program to make super-soldiers dedicated to the country. In this program she was subjected to harsh military training and scientific experiments to amplify her natural abilities. At some point a portion of the Bomb Devil's body was placed inside Reze, thus turning her into a devil-human hybrid.

Bomb Girl arc
As Denji takes cover from the rain by hiding inside of a phone booth, Reze appears and dashes into the same booth. She greets him and makes comments on the weather before laughing at him and claiming that he reminds her of her dog which has passed away. Denji is initially confused causing Reze to apologize but Denji vomits up a flower he had eaten earlier and presents it to her. Reze thanks him for the flower, blushing heavily, which catches Denji off-guard. Reze lets him know that she works part-time at a café called Crossroads and invites him to come by sometime.

Reze wanders over to the café and puts on her apron to work and greet her boss. Her boss docks her pay for her lateness and orders her to take a water over to Denji who has already arrived, pleasantly surprising Reze. She sits next to him and orders a coffee for herself and Denji. Denji makes a disgusted face after tasting the coffee causing Reze to laugh. Her attitude and closeness makes Denji think that she has feelings for him, causing him to worry as he tends to like anyone who likes him back.

Denji keeps coming back to visit Reze at the café every day for a full week, ostensibly to order lunch there. Though Denji doesn't want to distract her from her studying Reze insists on sitting next to him and is shocked when she discovers that he doesn't know how to read. When Denji expresses a wish to have gone to school with Reze, Reze smiles slyly at him and suggests that they both go and visit the school after dark and explore it.

Reze and Denji go to the school and wander the hallways while holding hands. They go to a classroom where they play Reze giving Denji basic lessons. Reze again expresses surprise that Denji never went to school and thinks that it is sad and messed up. She asks him if he is happy with his current occupation killing devils in exchange for the bare minimum standards of living but Denji doesn't have an answer.

At Reze's suggestion the two of them go to the school's swimming pool where Reze strips off and invites Denji in to swim with her. Denji is initially hesitant because he cannot swim and he fears his growing feelings for her but eventually he splashes into the pool and Reze offers to teach him how to swim, and then offers to teach him everything.

After they get out of the pool Reze asks Denji if he'd prefer to be the country mouse or the town mouse, referencing Aesop's fables. Denji opts to pick the town mouse as the food is way better and it seems more fun but Reze thinks that the country mouse sounds better since they'd have freedom. She asks Denji if food and fun are the only things he cares about which he agrees with. Reze invites him to go visit a local festival and after he agrees she runs off to the bathroom, leaving Denji alone in the classroom. As she walks down the hallway Reze turns around a notices a person behind her which she initially mistakes for Denji. The man steps into the light and brandishes a knife at her.

The man chases Reze out onto the school roof. He explains to her that he will use her as bait after maiming her in order to force Denji to surrender and that he'll kill Denji easily once that happens. As he goes to stab her however Reze jumps onto him and easily pivots around to his back, breaking his arm in the process. She puts him into a stranglehold and chokes the life from him as she recites a poem in Russian. Once he's dead she stands up and notices the Typhoon Devil's presence nearby. She calls him out as the one responsible for the storm trapping them in the school and accepts the devil's apology so long as he removes the body of his assassin and obeys her for a while. Reze then goes and reunites with Denji in the classroom.

The two of them go to the festival as planned and end up at a cliff side to get a good view of the fireworks. As they wait for the fireworks to go off Reze restarts their earlier conversation about Denji's terrible situation and asks him if he'll quit his job to run away with her, swearing to make him happy and protect him.

Denji questions why she would go so far for him and Reze confesses that she likes him. After hesitating, Denji states that he likes her too but due to growing recognition within his job and his feelings towards his coworkers and Makima, he's started to enjoy his life more and more. He asks Reze if he could keep working as a devil hunter and still see her, to which the latter responds by saying that Denji must already have someone he likes. She suddenly kisses him on the mouth as the fireworks go off in the background but midway through the kiss Reze bites Denji's tongue off and taunts him with it. She pulls out a knife and cuts his throat, and then cuts his hand off before he can pull his chainsaw cord.

As he collapses to the ground in pain and shock, Reze kisses him again and apologizes before stating that she will take his heart now. Suddenly Beam dashes out of the ground and grabs Denji, taking him away from Reze. Reze scornfully looks down at them and pulls the pin on her choker, causing her head to violently detonate. Her mangled body regenerates into a hybrid state and she rushes after Beam and Denji using the force of an explosion to propel her.

Reze swiftly catches up to Beam and prevents him from fleeing with Denji. She offers to let him live if he leaves Denji behind but Beam responds by transforming his head into an enormous shark's head. He leaps at her but she casually stops him with one arm and engulfs his body in an explosion that causes him to revert to his original form.

A group of civilian devil hunters pull up to the scene in their car and show caution at Reze's appearance since she appears to be an intelligent speaking devil. Reze snaps her fingers and blows them up, before noticing that Beam took advantage of the distraction to escape with Denji. Reze follows Beam to the headquarters of the Second Division and puts on an unconvincing excuse that she's being chased by a devil. Aki and Beam evacuate with Denji and as Reze realizes that her initial plan did not work she decides to settle on her backup plan which is to massacre everybody.

Nomo orders Kato and Tanabe to kill through Reze any means necessary as Aki leaves. The two of them bite their hands and point at her causing mold to grow in her internal organs and injure her, however Reze pulls the pin on her choker once more and blows her own head off. They initially mistake her actions for suicide but Reze's decapitated body picks up her head and throws it into the Division 2 headquarters where it explodes. Nomo is distracted by this and fails to notice Reze's body running at him until it is too late and a second explosion engulfs him. Meanwhile Reze has regenerated from her head inside of the Division 2 headquarters and slaughters everyone inside.

Some of the devil hunters trying fighting back against her but they are swiftly blasted apart before they can open fire. A severely injured Nomo reappears and tries to use the Fox Devil's arm to grab Reze but she dodges his attack and lands in front of him. Just before she can kill him the Vice Captain of the second division appears and uses the Fox Devil's head to swallow her whole.

Before they can celebrate their victory the Fox Devil promptly decides to leave due to Reze's disgusting taste and the fight resumes. Aki foresees a bad future thanks to his contract with the Future Devil and brings his car to a stop; Reze lands in front of the car and brandishes the decapitated heads of Nomo and the Vice Captain. Reze orders Aki to unload Denji and drive away, claiming to prefer that there should be as little bloodshed as possible. Aki ignores her and drives away causing Reze to sigh and chase after him. She lands on the roof of the car and prepares to blow it up but the Violence Fiend leaps in to kick her off.

He tries drop-kicking her from above but she easily blocks his attack which shocks him. Seeing that he can't fight her, the Violence Fiend calls out to Kobeni Higashiyama and orders her to retreat. Reze turns around and sees a frightened Kobeni collapsed on the ground who begs for mercy. Reze decides to leave her and resumes the chase after Denji.

Reze catches up to the car and lands on top of the truck in behind it. Denji wakes up and transforms into his Chainsaw Man mode, cutting his way through the roof of the car to face Reze. Denji tells her that he realized that every woman that he's met in his life has tried to kill him and that it's sad that none of them care about him. Reze claims to truly like him, confusing Denji briefly until Aki snaps him out of it. Reze and Denji both lament their current situations and Denji declares that he's putting Reze under arrest to stop her spree of violence. Reze invites Denji up to her, offering to teach him how to do battle and he leaps up to fight her.

Reze swings a punch at Denji and blows up the truck they're both standing on, sending him flying into a building. She leaps after him and sends him explosively flying through multiple walls though he managed to block the attack. Reze comments that he isn't applying his powers well and reveals that she stuck a portion of her skin to his chainsaws which she causes to explode remotely.

Denji leaps out of the explosion at her but with casual ease Reze sends him flying up into the sky before slamming back to the ground by transforming her leg into a missile. She lifts up his mangled body, observing that he was already regenerating due to revving his chainsaw cord during the attack and blows up one more time for good measure, reducing him to a charred, limbless wreck.

Reze makes her escape, carrying Denji with her but she ends up walking past Aki who is lying on the ground, disguised as a corpse. He stands up and cuts off her left arm with a surprise attack. Reze regrows her left arm in an explosive attack which Aki narrowly dodges due to his future sight. The two of them exchange blows with Reze eventually creating a missile out of her arm to launch a massive explosion - however Aki is saved by the intervention of the Violence Fiend.

Reze calls for a time out due to being anaemic and basically naked but Aki and the Violence Fiend decline her request. Suddenly the Typhoon Devil bursts onto the scene through a nearby building to save her. A recovered Denji jumps back into combat, riding Beam like a steed which amuses Reze who prepares to battle Denji alongside the Typhoon Devil.

She causes numerous explosions around Denji and Beam who point out that her aim really sucks. As they pass by her, Denji cuts off Reze's leg but the Typhoon Devil spits a mass of blood into her mouth, replenishing her supply and allowing her to regenerate from the injury.

Denji and Beam defeat the Typhoon Devil, cutting him to pieces, but Reze swoops in from above and engulfs them in an explosion. Beam saves Denji from the affects of the attack by swallowing him but bears the brunt of it himself and is knocked unconscious. Denji extracts himself from Beam and thanks him before facing Reze once more and prepares to finish the fight.

Reze flicks an explosive at Denji as he revs up his chainsaws and blows off his right arm, following up with an explosion that sends him down to the waterfront. Reze requests that Denji die already but Denji counters that if Reze had really wanted him dead the entire time that she could have just killed him when they first met. Reze contemplates that for a moment and tells Denji that there is no place for him to run to.

He counters that it was a mistake for her to teach him how to swim and looks at the sea behind him. Reze blows up Denji's left arm but it remains hanging on by a length of chain which Denji uses to wrap around Reze and drag her with him off the edge of the pier and into the water. The two sink down to the seabed and reminisce on their time earlier in the swimming pool together.

She wakes up on the shore next to Denji and Beam and questions why Denji revived her. He explains that given his immortality he doesn't care what bad stuff happens to him so long as he can eat good food the next day and write it all off, but if he turned her in to Public Safety then it would leave him with a bad feeling. He finished off by saying he wouldn't even mind being killed by her since she's hot.

Reze bursts into laughter and flatly tells Denji that all of her expressions and blushes since they met have been nothing but an elaborate act before turning to leave the scene since she spent too much time fighting him. Denji offers to run away with her, unconcerned that she's a murderer since even if her words were lies, she still taught him how to swim. Reze steps up to him and breaks his neck, warning him to wise up a little before leaving. Denji calls out to her that he'll be waiting for her at the cafe at noon.

During the aftermath of the explosive battle, Reze, in a civilian disguise, goes to the train station and considers getting aboard. Before doing so, she picks up a flower from a charity stand. Once Reze reaches the train station, she stops to gaze at the flower she received, and remembers the time Denji gave her that same flower when they first met at a telephone booth. She then chooses not to enter the train as it passes by her, having changed her mind regarding Denji's offer to run away together.

Reze decides to head back to the café she formerly worked at, with hopes of finally living out a free life with Denji. As she moves through an alleyway toward it, Reze begins to smile with anticipation as she sees Denji waiting for her at the café. Before Reze can leave the alleyway opposite of it, she is suddenly stopped by a swarm of rats that appear at her feet. The rats coalesce into a humanoid form and reveal Makima who bars Reze's way, preventing the latter from reaching Denji.

Makima gives a speech about how she prefers the country mouse, referencing Reze's earlier conversation with Denji at the school. Despite knowing she has no chance of defeating Makima, Reze refuses to let the latter strip her and Denji of a free life, readying herself to fight back. Before she can pull her pin and activate her transformation, her right arm is suddenly cut off by a spear thrown from above. Seemingly unfazed by this, Reze then pulls out a knife she had hidden with her remaining arm, and readies herself to stab Makima in the back.

She then moves to attack Makima from behind but another spear pierces through her body, thrown by the Angel Devil on a rooftop. Slowly depleted of her lifespan, a fatally wounded Reze attempts to pull her grenade pin to transform but Makima stops her from doing so. In her final moments, Reze internally questions herself why she didn't kill Denji the first time they met, and reflects that this was because she empathized with him before "dying".

International Assassins arc
Sometime after his battle with Reze, Denji recalls her smile when he sees Aki drinking coffee, noting that his heart has been irreversibly broken by her. Before he can think any further thoughts of Reze, Makima distracts Denji by inviting him and the others on a paid vacation to Enoshima.

However, the vacation turns out to be a ruse as Makima reveals that Denji is now placed under protection due to his existence being revealed to the world. She also scornfully comments that Reze fulfilled her task by making Denji's presence known globally after their fight is shown on TV.

Control Devil arc
Despite her presumed "death", Reze was abducted and brainwashed offscreen by Makima to serve her needs. She is summoned as part of Makima's newly-formed Special Division 5, a team of weapon hybrids created for the sole purpose of battling the fully-powered Chainsaw Devil. While under Makima's control, she behaves with great affection towards her contradictory to her original character.

After Makima commands Special Division 5 to attack, each member activates their weapon trigger, transforming into their Hybrid forms. They all leap from their respective spots to lunge straight towards Chainsaw Man. Before any of the Hybrids can land a single blow on him, Chainsaw Man acts quickly by leaping forward from the building he is standing on to initiate the fight.

Later on, Chainsaw Man narrowly avoids getting engulfed by the Flamethrower Hybrid's flames, only to find himself attacked by the Whip Hybrid on another building. However, Reze interrupts their skirmish by blasting through the building to grab Chainsaw Man, carrying him into the sky. Reze is then immediately decapitated by Chainsaw Man before she can do any further damage to him.

At some point in the future, Reze is revived once more by Makima, alongside the rest of Special Division 5, and brought to a graveyard to confront Denji. Once Makima finishes monologuing her thoughts of erasing anything she dislikes to Pochita (who is disguised as Denji), Reze and the other Weapon Humans transform into their Hybrid forms for the final battle.

During this confrontation, Reze and the Whip Hybrid attempt to attack Pochita from both sides after he is impaled by the Spear Hybrid. However, Pochita retaliates by using a spinning aerial slash to take down Reze and the other two Hybrids, who all fall to the ground upon being defeated.