Tsuzuki Momoka

A high school student and satoshi's little sister who's younger than him by several years. She has a bright personality who doesn't shy away from anyone, getting along with pretty much everyone is her specialty.

Momoka was invited by their parents to join the overseas trip, but she refused.

However, the house was too large for her all alone so she's borrowing a detached room at an inn, and is helping out in the inn whenever she has time.

Although she hasn't decided on her future plans, she wants to live together with Satoshi.