Mayumi Doujima is the protagonist of the Bishounen Series. She is the only female member of the Pretty Boy Detective Club, although she dresses up as a boy. Mayumi usually has a gloomy demeanor, and people have said that she has a "bad personality". According to her own words, she hates beauty, and particularly hates having her eyes called beautiful, as when Manabu Soutouin compliments them, she starts trembling in anger. Although it doesn't usually show, Mayumi is very determined, as she could keep searching for the star that enchanted her for 10 years, even when everyone around her called her dream stupid. She herself has told the Pretty Boy Detective Club, when they accepted her request, that she doesn't see why they would waste their time on her stupid, childish request, to which the boys told her that they themselves are pretty childish.