Chainsaw Man Church

The Chainsaw Man Society for World Peace, often referred to as the Chainsaw Man Church is a project developed by Fami and Haruka alongside an unknown third member, with the stated intention of aiding Chainsaw Man to prevent the upcoming Age of Devils prophesized by Nostradamus and achieving a "world without evil." The group also has a hidden goal of weakening Chainsaw Man to allow him to live a normal life as a human. Fami is the supposed brain of the group, whilst Haruka Iseumi's role is solely to attract more people to the cause. While Haruka is a member of the three "leaders" he isn't fully aware of the meaning behind their actions. Asa joined the church under the promise of separating Chainsaw Man from his Devil heart, allowing Yoru to kill the Chainsaw Devil whilst Asa can live with "her" Chainsaw Man, as a compromise between the two. Currently she's a Devil Hunter/Poster Girl for the church and is paid with its donation money.

According to Yoshida, whilst the movement was initially founded and composed of diehard supporters and refugees from Devil attacks, its numbers exploded due to its popularity among high school students. The group also accepts donations for their campaigns, both from civilians and politicians. Its numbers are said to exceed 20,000.

The church uses a fake Chainsaw Man who pushes a narrative involving Adam and Eve where he wants to achieve a world without Devils, much to the chagrin of Denji. After Asa Mitaka becomes a member she quickly gains notoriety and many members of the public start attributing Chainsaw Man's past achievements to her instead, further frustrating Denji.

It is revealed that the Church's main building once belonged to another cult and that the organization is run and made up almost entirely of students who are mistrustful towards adults. Every newcomer gets to sleep with a member of the opposite sex, whom they are then forced to marry in the Church's chapel and then raise their children together. The Church is also extremely anti-American, often justifying their most extreme practices by saying they’re subverting American traditions, and spread unhinged conspiracy theories about supposed acts of USA government. Denji briefly considered joining the church, but quickly changed his mind and fled once he's decided they're all insane.

Current arc
The founding of this organisation was announced by Haruka Iseumi on a TV broadcast shortly after the Falling Devils attack. Initially he claims the goal of this organisation is to fight Devils alongside Chainsaw Man to stop an upcoming apocalyptic threat; the Nostradamus Prophecy. Though he's initially met with mockery by the members of the audience, in the following days its membership quickly grew, exceeding 20,000 members, most of whom are students. In response to it's massive growth it's even begun receiving political donations.

Followers of the church frequently went out into the streets and violently clashed with anti-Chainsaw Man counter-protestors and the police, spurring fears of an eventual larger conflicts as the church's numbers grew. The church has also sparked outrage among concerned parents as it's members were often assigned Devil hunting duty. In response to these accusations of irresponsibility Haruka frequently goes on TV to reassure the public that they are professionals and work closely with the city's authorities and the Ministry of Defense. He further claims that only the most devoted believers of "Chainsaw Man's teachings" are allowed Devil hunting tasks. As proof of direct cooperation with Chainsaw Man, Haruka reveals Fake Chainsaw Man to the public, claiming to be real deal, hiding behind a made up backstory.

Fami soon arrives directly at Asa's household to recruit her and Yoru into the church. To them she reveals a different goal from what's publicly stated; that being, keeping Chainsaw Man from fighting Devils in order to weaken him so Devils won't go after him. Both Asa and Yoru are convinced to join the church, as by weakening Chainsaw Man, both of them would be able to achieve their goals; Asa's being to help save Chainsaw Man as thanks for all the times he saved her, and Yoru's being to kill the Chainsaw Devil.

Despite being initially very hesitant towards Fami and the church, they ultimately agree. Within a short timeframe Asa becomes the church's most notorious Devil Hunter, slaughtering Devils in droves while also gaining a cult following of her own among the public in the process.

Trivia

 * The organization is consistently called the "Chainsaw Man Kyōkai", but the written kanji for the last word is "協会 (organization/association)" when it's first mentioned in Chapter 132, then "教会 (church/congregation)" afterward. For this reason, it was initially translated as "Chainsaw Man Society", but then became "Chainsaw Man Church", with the initial mention being reedited after a few days.