 The plots within the novel, manga and anime are each rather different from one another, and many themes and personalities differ between each.The novel also regularly mentions drug use by the main character, and later, his friend, Yamazaki.This element of the story is downplayed in the manga (drugs Satō uses are referred to as "legal psychedelics purchased off the internet"), and left out of the story altogether in the anime (with the exception of Hitomi).