Nao Takanashi has long been trying to tempt her brother, Shūsuke, into entering an immoral (i.e. incest) relationship...

It turns out that Nao and Shuusuke are not related by blood. While most people would be upset after finding out somet...

Iroha coerces Shūsuke into going on a date with her, and Nao decides to follow them, while her friends, Haruka and Hi...

Nao coerces Shūsuke into going to the beach with her, though coincidentally they end up running into Haruka, Hirono a...

While running back from buying a new porno magazine, Shūsuke bumps into another person. They get their packages mixed...

After having Iroha spy on Shūsuke and Mayuka the previous night, Nao tries putting on black pantyhose and clinging on...

Shūsuke and his friends go on a trip to Akihabara in search of adult goods while Nao and Iroha decide to follow them....

When Shūsuke gets a report about him failing in all of his subjects, he then realizes that he has to take a follow-up...

Shūsuke goes to a Matsuri festival with Nao and Iroha, who compete with each other to try and seduce him. Meanwhile, ...

Late on night, Shūsuke spots a sexy cosplayer named Ran Yatagai on top of a vending machine. He later sees Ran, who c...

As Shūsuke puts up with more of Ran's dubious rituals, Rin forces Nao to hang out with her by threatening to tell Shū...

Shusuke and Nao are left alone in the house when their parents go on an overnight trip. Nao takes the opportunity to ...