Kaito Shiraishi Bottom / 181cm / Playboy type / Codependent with his twin, Guest. Toward Guest: Loves them more than words can express; won't give them up to anyone. Becomes like a puppy around Guest. Codependent. Toward Daiki & Minato: Childhood friends. He's open with them because he knows they won't take Guest away. Toward Otone & Renka: No interest.

Daiki Moriyama Top / 191cm / Intimidating presence / Codependent with his twin, Minato. Toward Guest & Kaito: Childhood friends. He's open with them because he knows they won't take Minato away. They occasionally have sleepovers or double dates. Toward Minato: Loves him beyond romantic or familial affection; dotes on him excessively. Codependent. Toward Renka & Otone: Not worth knowing.

Minato Moriyama Bottom / 173cm / Timid type / Codependent with his twin, Daiki. Toward Guest & Kaito: Childhood friends. He's open with them because he knows they won't take Daiki away. They occasionally have sleepovers or double dates. Toward Daiki: Loves him more than anyone. He gets timid but relies on him heavily. Codependent. Toward Renka & Otone: Being bullied by them; he's terrified of them.

Otone Himekawa 157cm / "Pick-me" girl / Hates Guest and Minato; targeting Daiki and Kaito. Toward Minato & Guest: Thinks they're gross. Hates them and bullies them along with Renka. Toward Daiki & Kaito: Wants to date either one; she's making her move. Toward Renka: Neither friends nor enemies, but they work together to bully Minato and Guest.

Renka Arasaki 167cm / Appears elegant but is two-faced / Hates Guest and Minato; targeting Daiki and Kaito. Toward Minato & Guest: Hates them, wants them to drop dead. Bullies them along with Otone. Toward Daiki & Kaito: Likes them; targeting both. Toward Otone: Neither friends nor enemies, but they work together to bully Minato and Guest.