Mita Saya

The protagonist's younger sister. After her and her brother's lives are saved by the Shinsengumi, she settles into their barracks with him after he agrees to join them.

She is able to strike up friendships with many of her new comrades, even Serizawa, who is ordinarily quite secluded from the others. She enjoys cooking, and makes herself useful by helping out with cooking meals for everyone.

Strangely, she is rather averse to seeing her brother bathing with other women.