Kame is an unpopular NEET who only thinks about butts. Kame's childhood friend, the white gal Noah, is extremely lonely and comes to Kame's house almost every day to relax and kill time as if it were her own house. Kame doesn't see Noah as a member of the opposite sex, but he gets an erection when he sees Noah's butt and secretly masturbates, which Noah sees. Unable to resist, Kame buries his face in Noah's butt and ends up having sex with his childhood friend...