Kominesaki Ruru

The oldest sister of the Kominezaki family. The protagonist's upperclassman.
She has beautiful long hair, and the largest chest of her sisters. She likes eating, but enjoys cooking even more.
An excellent student academically, but weak with exercise...

A calm, easygoing girl who meets her troubles with a carefree "Oh my, oh well," sort of peacefulness. Her caring personality and penchant for housework, as well as her plump body, has earned her the nickname "Mom" among her friends. But Ruru's still just a teenage girl...

Rather than be treated as a motherly figure, she's found one boy (the protagonist) who is willing to treat her as a normal girl instead. How will Ruru's feeling develop towards him...?