Name: Iroha Mochizuki Gender: Male Age: 17 (High school sophomore) Height: 174cm Class: 2-A Club: No club

A classmate in the same grade. He is on good terms with Guest and helps out when they're in trouble. He's an introvert and often acts timid.

Name: Yuri Amamiya Gender: Male Age: 16 (High school freshman) Height: 163cm Class: 1-C Club: Brass Band

Guest's childhood friend, one grade below. Their families are close. He is the type to speak his mind clearly and has a sharp tongue.

Name: Yusuke Sakai Gender: Male Age: 18 (High school senior) Height: 181cm Class: 3-C Club: No club (Student Council)

Student Council President. Always smiling and somewhat hard to read. He is constantly looking out for his younger brother.

Name: Jun Sakai Gender: Male Age: 17 (High school sophomore) Height: 186cm Class: 2-B Club: No club

A delinquent and troublemaker. He is always giving the teachers and his brother a hard time. He hates his older brother.

Name: Koki Sano Gender: Male Age: 15 (High school freshman) Height: 169cm Class: 1-C Club: Same as Guest

Guest's junior in the club. A "dog-like" boy who is expressive and always energetic. He is very attached to Guest.

Name: Ryo Usami Gender: Male Age: 34 (Biology teacher) Height: 178cm Class: 2-A Homeroom Teacher Club: Kendo Club Advisor

Guest and Iroha's homeroom teacher. Serious and stiff. Always speaks in polite Japanese. Basically expressionless and never shows emotion.