Kirepapa. - hentai in the yaoi genre based on the manga of the same name by Takagi Ryou in 2008 at the Prime Time studio.

Chisato Takatsukasa is a novice writer. He looks very young even though he is well over thirty and he has a teenage son, Ryou-kun. The whole story revolves around the relationship (which is far from ordinary) between father and son. Ryou began to be looked at by his insolent classmates, and the impressionable Chisato lost sleep watching his son and remembering his past "experience"...