Kyoichi and Saeko, who are a student and a teacher, a nephew and an aunt, are in a forbidden relationship that can't even get married. It was a secret relationship with those around him, as well as with Shiho, Saeko's daughter and Kyoichi's cousin. One day after school, Shiho is called by Terushima, who is rumored to be a perverted teacher. There she is shown a voyeur photo of her Saeko, who suddenly reveals her unpretentious appearance. According to Terushima, she was sent to school with a threatening letter. . . She is asked for cash or a photo instead, and Shiho, who cares about her mother, agrees to take her picture on the condition that her face is not shown. But it was a sneaky trap by Terushima! !
