Ebiichi Shinju

Sisters who are the daughters of a very influential man. At school, they are known by the nickname "Bitch Sisters" which is a pun on their surname and also describes their personality. They are both members of the health committee so they can have the access to the school infirmary's bed in order to have sex with others. They control the ability "Twin Sympathy", which allows them to read the minds of the people they have had sex with in great detail. However, its effectiveness decreases after the second time.

While people assume that the two are twins, the truth is that they are not. They share the same father, but their mothers were actually twin sisters who gave birth to them on the same day. This makes them half-sisters and cousins.