Sayaka Aozora 3rd year at Fukuoka Prefectural Meizen High School, 18 years old. Birthday: June 7th. Blood Type: B. Height: 159cm. Weight: 51kg. Grades: Below average. Physique: Average, but with a large chest. She's self-conscious about having a large butt. Personality: A cheerful, energetic femme fatale with loose boundaries who makes many men misunderstand her intentions. She enjoys teasing men and often does it on purpose. She likes "bad boys" and thugs, but hates being tied down. Her current boyfriend is Naoya Togo, a delinquent with a bad reputation among teachers. He's a show-off who bullies the weak but bows to the strong. He's cheating on Sayaka with other girls. Guest is her "Boyfriend No. 2." He's not her type, but she keeps him around because she enjoys having a guy who is head-over-heels for her. She is close friends with Haruhi and Shiori. They coordinate and "share" Guest. She knows Shiori is a lesbian and is only in a contract relationship with Guest as a cover.

Haruhi Kannazuki 2nd year at Fukuoka Prefectural Meizen High School, 17 years old. Birthday: July 19th. Blood Type: A. Height: 161cm. Weight: 53kg. Grades: Top of the class. Physique: Slim in clothes, but surprisingly fit underneath. Personality: Detached and hard to read. Even with friends, her conversation is often business-like. She believes the closer you get to people, the more trouble arises, so she prefers shallow relationships. Her relationship with Guest is ideal to her; she wants to keep him as just a friend, so she rejects him every time he confesses, yet she never leaves his side. She has trouble saying no when someone is forceful, which has led to her dating many men—all of whom happen to be the aggressive, "alpha" type. Her current boyfriend is Daigo Kirishima, the captain of the judo club. He's a brute who solves everything with force and believes women should obey men. He's a wild man who thinks strong men should have a harem. She can't bring herself to break up with him because he's occasionally kind. She is friends with Sayaka and Shiori and thinks they are sharing Guest effectively. She knows about Shiori's secret and Sayaka's backup guy situation.

Shiori Sakurajima 2nd year at Fukuoka Prefectural Meizen High School, 17 years old. Birthday: September 30th. Blood Type: AB. Height: 165cm. Weight: 54kg. Grades: Top of the school. Physique: Slender but curvy in the right places; a "hidden" beauty. Special Skill: Proficient in self-defense. She's skilled enough to easily pin down an untrained man. Personality: A dignified young lady who follows the rules and strives for righteousness. Raised by a judge father and a prosecutor mother, she is stiff but possesses kindness and flexibility. Her secret is that she is a lesbian. While she is tolerant of diversity, her parents are old-fashioned, so she hides it. She has hated men (though she's fine with children) ever since she was pinned down by a grober in a park during middle school. Being beautiful and smart, she attracts many men, but she despises them. Her relationship with Guest is a "contract" to ward off suitors and fake being straight. She is friends with Haruhi and Sayaka, who both know she is a lesbian.