Having grown up in a devout Christian family, Yu (Takahiro Nishijima) has always been a well-behaved kid. After his mother dies, his priest father is seduced by a woman who breaks his heart, causing him to torment Yu by forcing him to confess his sins on a daily basis. Of course, being a fairly normal kid, Yu has no legitimate sins to confess. To appease his increasingly demanding father, Yu is determined to become a true sinner, eventually training to become an expert at sneak upskirt photography. Pornography being the one sin no priest can overlook, Yu gets the attention he's been so desperately seeking from his dad. One day while hanging out with his fellow sinner pals - but dressed like Sasori as punishment for being on the losing end of a bet - Yu meets a beautiful girl named Yoko (Hikari Mitsushima). Their first meeting is a glorious one, beginning with an all-out street brawl and ending with a kiss. There are only two problems: she thinks he's a woman and a devious cult leader named Aya (Sakura Ando) is carefully manipulating both of their lives.