Riko is a successful businesswoman who is firmly established in life. She works hard in her company and is liked by everyone. She even got a promotion recently – she’s a real achiever! However, she has one tiny little weakness: her brother Takashi. As usual for a sister, she cares a lot for her little brother; but in a very different way.
One day, she decides to pay her brother a visit after work. His flat is dirty and untidy, so she decides to tidy it up a bit. In the process, however, she finds a very special porn about the benefits of anal sex. Can it really be that such a successful woman like her has never tried it before?! She promptly decides to try out this exciting new practice … but one finger soon isn’t enough. And to make matters worse, her little brother bursts in with his girlfriend Yumi, who sees the whole spectacle as a declaration of war about Takashi’s favour. Can all this really be true?
