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Mai, the middle sister, is a tomboy-ish 14-year-old girl. She has pink hair and usually wears sporty looking clothes. Mai is constantly reminded of her flat chest by her younger sister Mii which causes her to blow a fuse.

Early in the season she was acknowledged for having problems with constantly moving for which she got constantly depressed about to the point she refused to go to school. This was because she thought everyone hated her after making friends and then abandoning them. She understood the impact of their journeys on others, unlike Mii, but did not have the mental maturity, like Ai, to cope with it.

Later in the series she makes friends with a classmate of hers, Konami. When it was time to leave, Konami helped convince Mai that she was wrong and in consolation Mai left a sketch portrait Konami they were to make for a class assignment for Konami as a departing gift stating that they'll remain friends forever, even if they never see each other again.

While she waits for Mai's return, Konami passes away 2 years before the mansion is in a location where they could meet again. She still was hoping to see Mai again. Later in the series Mai meets Konami's daughter and at first mistakes her for Konami, but quickly learns her name is Mai, the same as herself and named by her mother after her friend. Mai discovers that Konami's daughter, Mai, has more in common with her than a name. She reselmbles what the younger sister Mai was like before meeting Konami and feels it's her duty to both Konami and her daughter to show her that way of thinking was wrong, just as had been done to her.