Chinkamo Twins! My Twin Sisters Are Totally Into Me?!

Chinkamo Twins! is a Japanese adult visual novel about a young man whose twin sisters are a little too into him. Saya and Uya are in danger of failing their classes at school: Saya neglects her studies in favor of manga and gaming, and Uya would rather play on the basketball field. Their big brother, a teacher at their school, organizes a study session to help the reluctant girls learn in exchange for pampering them. As Saya and Uya's competitive spirits lead them to fight over the attention of their dear brother, they soon realize that their affection for him is more than just sisterly love, and begin to make romantic and sexual advances.

This is a kinetic novel, a type of visual novel which contains only one story route with no branching paths or alternate endings. However, the player is able to make choices during sex scenes which determine the order in which events are played out. There is also an option to change the sprites of the twins to give them animal ears, make them naked, or both at the same time. The game features voice acting for Saya and Uya.