Alisa Mikhailovna

She seems to be quite the possessive type and gets jealous easily, although it only shows when Masachika interacts with other girls. To best describe her, she's a tsundere who often teases Masachika. She is also hopelessly in love with Masachika, though most of the time she is unaware of her intense feelings towards him, and any attempts to acknowledge this are met with self-denial until much later.