Hasekura Mia

A college student at a local university.
Her biological father died when she was young, and she and Makoto became siblings when her mother remarried.
She is a serious and firm person who is relied upon by everyone around her.
However, when her doting younger brother is involved, she is a bit lax in her judgment.
She cares for Makoto, but her feelings are family ones, and she has no romantic feelings for him.