Sumireko Sanshokuin

Sumireko Sanshokuin is one of the three initial heroines introduced in the series. Her nickname, Pansy, is a wordplay from her full name 三色院菫子. When the 院 and 子 removed, the remaining character (三色菫) form the Japanese name for Viola tricolor or Wild Pansy flower. She is usually called by her nickname to those who are close to her. Initially introduced as a librarian committee member with a petite build and plain face, she spends her time observing people who come to the library and somehow took interest in Kisaragi Amatsuyu. She is known to be gloomy by the majority of the student. She usually ties her hair in braids. In actuality, she hid her true looks behind plain getup and a "sarashi" to bind her chest to make it smaller than it actually is. Amatsuyu describes her true looks as "Big Breasted Cuties". In her true form, she is admittedly beautiful, even rivaling the school's beauty queens, Cosmos and Himawari. Her personality is generally polite to her peers, only turning sharp-tongued when interacting with Amatsuyu. She is shown to be a rather observant character, as she is able to assess a situation from the sideline. She also has above-average intellect, shown by her capability to tutor her fellow friends. Beneath her gloom and timid look, she hides a strong charismatic presence. Although she is beautiful, she is not comfortable showing people her true form as she stated that she'd only let Amatsuyu see her in her true form when asked to change her looks in general by Amatsuyu. She is good at Classic Literature. She doesn't like Math.

She is the original affection object of Taiyou Oga. The thing she wants the most is "a preserved, confined, and ornamented Joro". When asked whether she wants a dog or a cat, she picked Amatsuyu, reinforcing the fact of her infatuation for Amatsuyu. She also has never read a manga before. She compared herself to a chameleon, alluding to her double-faced nature that hides her true look to blend with the background. She likes to stalk Amatsuyu, as she stated that it'll be the most likely thing for her to do first thing in the morning. She's a morning person. She likes Western Food. Her favorite season is Spring. She hates eating konyaku and she also hates cars.