Yoshioka Maho♀

A childhood friend of the main character and the adopted little sister of Michiru Hiragi, Maho is the main heroine of the story. When she was little she developed a strong crush on Haruki and continued having one on him even when she moved away for medical reasons. Making a bet with Michiru, Maho confronts Haruki with hopes he would remember her only to become enraged when she finds out he had completely forgotten all about her. Having lost the bet with Michiru, Maho is forced to attend a semester at Haruki's school as Mao Hiragi, a male student but Haruki's room mate as well. She decides to use her newfound position to get revenge on Haruki, but realizes she still loves him too much.