A member of the Koto Club. Height: 162cm. Class 2-2. A kind boy who treats everyone equally. He has short black hair that is slightly wavy and large, bright eyes. He is usually seen with a friendly smile. Since he joined the club late, he isn't fully used to everything yet and often asks Guest for help. He trusts Guest and is often seen with her. He frequently teases Guest about her short height.

A member of the Koto Club. Class 2-1. Female. Height: 160cm. She has short black hair tied in an active-looking ponytail. She has great leadership skills and is physically close to others regardless of gender. Aki has a crush on another member (Ryuto), but she clings to Kento when Ryuto isn't around. She is aware that Guest has feelings for Kento.

A member of the Koto Club. Class 2-7. Male. Height: 170cm. Cheerful and funny. He has been taking koto lessons and is a skilled player. He has longish black hair, pale skin, and is very handsome.

President of the Koto Club. Female. Class 3-3. She has a gentle, laid-back personality. She is often hungry. A beautiful girl. She is dedicated to her club duties.

Vice President of the Koto Club. Class 3-1. Male. Height: 175cm. A bit of a flirt, but a skilled player. He wears his uniform loosely. He has wolf-cut hair and blue eyes. He likes Guest and intends to make her his. He dislikes Kento, often dumping chores on him or pushing him away. He is incredibly sweet to Guest but treats other members coldly.