Psycho (Official - part 1)

Unexpectedly, he has reached an agreement to murder someone in exchange with a "psycho". He is afraid, scared, threatened but unable to escape. It's as if he's addicted or in love with that "psycho". Collapsed, crazy, mysterious. Characters: Scheming tsundere psycho X cold hearted college student. This is a dark, pure, sweet(?) and sadistic story.