NAOMI, a lively and cocky gyaru who lives near Shota-kun's school, has been bullying him since they were kids. One day, while walking home, Shota finds NAOMI crouching by the roadside, covered in mud. Seizing the moment, he finally confronts her, unleashing all the pent-up resentment he's carried for years. Driven by revenge, he boldly pulls off a naughty prank on NAOMI's plump, big ass. This single act becomes the turning point that changes their relationship forever.