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Yui Kotegawa (古手川 唯)Birthday: May 3
Height: 162 cm
Weight: 51 kg
3-sizes: 88-59-87 cm
Yui is a girl in Rito's class who seems a good deal more conservative than the others (except in the anime, where she's downright being portrayed as a school nazi, ruling the hallways with an iron fist), which is partially caused by her prettyboy brother and his habit of going out with different girls on a regular basis. She quickly comes at odds with Lala and her free-spirited personality, which she sees as a hindrance towards making the school a more peaceful and better place.
Eventually, she loosens up a bit, but she's generally more on her guard than the other girls. She becomes a part of Rito's harem all the same.
It is also implied (albeit rather briefly) that she might have feelings for Rito.