皇城 一花

Ren and Rin's younger stepsister. Their mother's (Ren's father's second marriage partner)'s child from another spouse. The kids met when they were in elementary school after their parents remarried.

A reliable person who handles all of the household chores. She is also an excellent honors student. She is shy, and has a hard time talking to the opposite gender. When she's just with Ren she likes to call him "Onii-chan" and fawn on him.