Yui Minamito

Yui Minamito (南戸 唯, Minamito Yui), once a neighbor and childhood friend of Manaka before moving away, acts more like a sister than a friend despite being only a year younger. She isn't at all shy around Manaka and is often found sleeping in his bed naked. Though considered one of the four main heroines in the series, Yui is never considered a love interest nor does she ever show Manaka any affection outside of their sibling-type relationship, although she acts at times like an overprotective big sister (especially when Satsuki gets unusually clingy), because Junpei was a crybaby in their childhood days.