Right after moving in, Tomoki spends restless nights tormented by the moans drifting from the room next door. When he discovers his neighbor is a married woman named Yuka, he can't hide his excitement at her sexiness. Unable to resist the moans again, he takes a secret peek... and finds Yuka writhing in pleasure while masturbating. Tomoki watches intently, but their eyes meet, and he panics and runs away. However, the next day, Yuka visits Tomoki's room with a smile, as if nothing had happened...