Kimi Ninomiya

Kimi is Ryo's younger sister.She quiet a loud mouth and is bossy to Ryo at times. She was the only person living with Ryo until Akari came. Kimi always thought that her parents died in a car accident since that is what Ryo told her. Whenever Ryo goes out to work Kimi has to look after the house and make dinner. She also gets very mad if Ryo and Akari get too close to each other.

(ref: Wiki)