Jesus Christ, I gotta give this manga credit for such a creative way to kill off the main villain. Usually, the shonen genre dictates that the MC must awaken to some new inner bullshit power, or the villain undoing himself through his own arrogance, or some other stupid deus ex machina asspull, but here? Practically the entire supporting cast is fighting tooth and nail, stacking every possible advantage they can scrape together. Every underhanded tactic, every trick in the book, every single person who can fight attacking and attacking until their literal last breath. The ones who can't also doing everything they can so the others can keep attacking, or can attack harder, or have an easier time attacking. Talk about a collaborative effort.