One day, apathetic [[OrdinaryHighSchoolStudent high school student]] Yosuke meets a beautiful girl named Eri. Eri does battle every night with an indestructible, chainsaw-wielding maniac Chainsaw Man. As Yosuke and Eri bond, he eventually joins the fight. Features CG effects by the talents behind the Manga/DeathNote series. Based on the best-selling novel by Tatsuhiko Takimoto.

A novel turned into a movie turned into a manga. ''Negative Happy Chainsaw Edge'' at first seems to be about a school girl with a katana fighting a guy with a chainsaw, then seems to be about death and how to deal with existential despair, then it turns out they're the same thing.
!!Provides examples of:
%% * ActionGirl: Eri, [[SarcasmMode to our great surprise]].
* AdultsAreUseless: They're out of town [[spoiler: or dead]].
%% * BadassLongcoat: "Chainsaw Man"
* ChainsawGood: The mysterious regenerating figure uses a chainsaw.The character wielding it is some sense evil (or at least misfortune) personified.
* DualWielding: Of knives. And katanas. But never both at once.
* GratuitousEnglish: The title.
* HeroicSacrifice: Subverted and Deconstructed. Yosuke tries to jump in front of a chainsaw that's headed for Eri; but Eri [[DefiedTrope manages to get both of them out of the way.]]
* KatanasAreJustBetter: The girl uses a katana, and it's badass.
%% * PantyShot
* ScarfOfAsskicking: Worn by Eri come winter. She also kicks ass.
%% * WordSaladTitle