Maaya♀

Maaya is Ayane's younger sister. She is a college student. She and the protagonist used to be classmates back in the day. She is very innocent and can be taken advantage of very easily. She tries to hide her personality of being influenced easily by being rough, but it isn't working too well. She has a complex about her small breasts and her wavy hair and often compares herself with her sister. She works as a waitress at the restaurant that Ayane manages.

[Edited from MangaGamer]