Haibara Ao

Second-year student at Ayatsuji University, and a maid at the Hinomori household.

She is Towa's daughter, and has worked as a maid for the Hinomori family since childhood. She entered university to learn about the outside world. There she met Masaaki and they became close friends.

A sociable, laid-back woman, she is liked by everyone.

She comes back to the Hinomori mansion after proposing to Masaaki that he work part-time there during summer break.