Barem Bridge/History

Control Devil arc
At an unknown point in time, Barem was brainwashed by Makima to serve her needs. He 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, he comments about how everyone in the group adores Makima.

Once 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, they are all blown back by Chainsaw Man leaping forward from the building he stood on to initiate the fight.

After Chainsaw Man beheads Katana Man inside a destroyed building, Barem appears on the bottom floor and aims his two flamethrowers at the ceiling. Screaming in excitement, he unleashes a large torrent of flames, creating a large explosion that forces Chainsaw Man to escape the building. He is eventually torn to shreds alongside the remaining Special Division 5 members after Chainsaw Man withstands their combined attack of sending him into space.

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

During this confrontation, he attempts to burn down Pochita once the latter is piled up by a group of zombies from the Zombie Devil. Unfortunately, Pochita uses his chain whips to latch onto two grave markers, and launches himself straight towards Makima's group using his chainsaws to slice Barem in half.

Current arc
Several months after being freed from Makima's control, Barem joins the Chainsaw Man Church alongside Miri Sugo, the Whip Hybrid, and the Spear Hybrid. Together, they form most of the church's top brass, with Barem serving as second-in-command of the cult. He eventually re-encounters Denji in the Chainsaw Man Church's headquarters. He orders Nobana Higashiyama, who was giving Denji a tour of the building alongside Miri, to return to his usual duties. He introduces himself to him and states that none of the Weapon Devils nor Denji remember the confrontation between Pochita and Makima, and that it is why they've already met each other even though they don't seem to reckon it.

After pretending to lend his hand to him, Barem raises two fingers and put them both into Denji's nostrils for fun, displaying his twisted sense of humour. He then remarks that Chainsaw Man hasn't been active for the past few days and questions Denji if he would come back if Tokyo were to be attacked by a powerful Devil. The latter replies that the city would be out of trouble thanks to its Devil Hunters and Asa Mitaka.

After comically commenting on the relationship between Denji and her, Barem suddenly suggests in a serious tone to kill Asa in order to make Denji become Chainsaw Man once again. He asks him what Denji is more likely to between living a peaceful wonderful life with friends, family, Meowy and his dogs or transforming into Chainsaw Man. This disturbs Denji, who walks away from him and Miri in disgust because of what he just heard. Barem waves to him from afar, telling him that they'll see each other again and wishing him to enjoy his normal life while he still can, threatening Denji implicitly.

A day after their failed attempt to recruit Denji, the Weapons discuss their plans of causing a large massacre at a Family Burger Restaurant. Barem reminds his fellow Weapons that as they are all born to kill, God will forgive them for such actions. The following day, Barem sends his group to a nearby food court, while he manages to find Denji, Nayuta, and Fumiko Mifune at an amusement park. He greets Denji and Fumiko, expressing that he is a big Chainsaw Man fan, even showing off his Chainsaw Man lighter.

He informs the two that there will be an upcoming attack on the building's first floor. However, this attack is stopped by Public Safety sending some of its members to subdue the church. Barem is then taken in custody by Public Safety agents, who escort him away from the chaos alongside Denji, Fumiko, and Nayuta. However, Barem explains to the group the true intentions of the church, and states that the Devil Fami contracted the church's members with is the Fire Devil.

Barem continues explaining the Fire Devil's powers as people begin transforming into mindless faux Chainsaw Devils who begin wreaking havoc and destruction across Japan. These creatures also slaughter the agents holding Barem captive, leaving only Denji, Fumiko, and Nayuta alive. Once he is freed from custody, Barem reveals that in about half a year, "The Great King of Terror" will descend, and that he and Fami plan to kill the king to save humanity.