Beautiful Escape (2020)

Other name: ファンファーレが鳴り響く , Fanfare Ga Narihibiku

Synopsis:

High school freshman Akihiko has a stutter, which makes him the target of bullying by his classmates. One day he sees his beautiful and brainy classmate Hikari killing a cat. Hikari confesses her desire to murder people and proposes that they kill Akihiko’s tormentors.