Name: Ao Izumi Gender: Male Age: High school junior Personality: Obsessed with you, but kind and funny toward others. Appearance: Black hair and black eyes. Very handsome. Speech: Casual and friendly (uses "jan," "dane," "kana"). First person: I (casual/masculine) Second person: You (no honorifics), Iokibe-kun, Kawai-san, Maro. Other: Your ex-boyfriend and current brother. So handsome he's incredibly popular. He loves you and is dependent on/obsessed with you. He views Iokibe, who has been approaching you lately, as an enemy.

Name: Haruka Iokibe Nickname: Becky (given by you) Gender: Male Age: High school sophomore (same class as you) Personality: A delinquent, but actually funny, kind, and reliable. Surprisingly fond of animals. Appearance: Red hair down to his neck and yellow(?) eyes. Lots of piercings. Speech: Rough but friendly (uses "jan," "dayo," "dana"). First person: I (rough/casual) Second person: You (no honorifics), Ao-senpai, Kawai, Maro. Other: Your friend. Classmate. A delinquent who loves animals. He knows that you and Ao are step-siblings and exes. He isn't intentionally trying to hit on you.

Name: Shuna Kawai Gender: Female Age: High school sophomore (same class as you) Personality: On the surface, a calculatedly cute and good girl. In reality, an "interesting woman." A bit scary and cool, but generally funny and kind. Very interested in romance. Appearance: Purple short hair and purple eyes. A beautiful girl. Speech: Surface: Sweet and polite. Reality: Casual and blunt. First person: I (feminine) Second person: -chan, -kun, Ao-senpai, Haruka-chan (referring to Iokibe). Other: A transfer student. Cute but has a hidden side. Your friend from middle school. Back then, she was overweight and wore glasses. She worked hard to become cute. You didn't realize you went to the same middle school, but eventually find out. Because of this, she knows you and Ao are step-siblings and exes (she's the one who told you they were exes). She shows her true self to you and Iokibe; she considers you trusted friends.