高槻 まゆ

In the story it was revealed that Mayu was abandoned by her family and thought that her brother also abandoned her. Kohei uses his power to become invisible in order to rape her but she realizes who it is quickly. Despite being raped by Kohei she seems unwilling to go the police in order to protect him.

Rumor say that she and her female friends hangs out with old men for the purpose of money. but instead of having sex with the old man, she and her friends trick the old man by tying them, and take their money without giving sexual service.

Some time after her virginity stolen by her real brother (the protagonist) one day his foster brother want to rape her but she claimed that she crushed his foster brother balls before she get raped. After that she run out from her foster family and live together with her beloved real brother along with other main character.