Upon settling into his new apartment, Tatsuhiko Kido, an art school student, makes a startling discovery of a crack in his wall. As he investigates, he accidentally comes face-to-face with his neighbor, Emiru Ikuno, midst her self-pleasure act. In an attempt to clarify the misunderstanding and address the crack, Kido stumbles and lands over her, only to worsen the situation as Emiru now holds photo proof of him committing lewd acts. As Kido learns about Emiru's fetish for voyeurism, he becomes her pawn as she blackmails him into keeping the wall crack unchanged. To Kido's misfortune, Emiru turns out to be a student at the same art school, and he can't seem to avoid her as much as he desires. Thus, Kido and Emiru commence a unique bond with one another, brimming with suggestive opportunities.