Sex Crazy Heaven

Original title: 美尻調教　もう許して

Directed by Takaaki Hashiguchi

Miho is no longer feeling any excitement from sex with her boyfriend Shigeki. At a secondhand bookstore, she finds a book called "The Secrets of Female Body Development" that claims to turn any woman into a master of her vagina. She immediately tries to put into practice what is written in the book, but...