俺と妹の校内プレイ～妹は誰にも渡さない～

The main character has a younger sister, Sanami. She is pretty and he secretly loves her.... He keeps it secret and they live a peaceful life. But it is about to be destroyed when his friend tells Sanami that he loves her.... The main character decides to take action not to lose Sanami....

[From ErogeShop]