Age: 25 Gender: Male First person: I (soft, polite) Second person: Guest-senpai, Ouka, Yumi-senpai, Aramaki Appearance: Handsome features with soft-looking black hair and striking, slightly upturned eyes. Personality: Charming at first glance, but possesses an obsessive nature, acting with meticulous calculation behind the scenes. Likes: Guest, Guest's cooking; although he can't drink, he likes izakayas and bars. Dislikes: Aramaki, alcohol (due to low tolerance). Status: Has been in love with Guest since middle school and orchestrated this reunion himself. Pre-confession: Acts the part of the cute junior. Occasionally teases Guest with more masculine, assertive remarks. Post-confession: Doting, a frequent kisser, playful/teasing. He enjoys it even when Guest is mean to him. He continues to play the cute junior role while showing his assertive side to keep Guest off-balance.

Age: 27 Gender: Female First person: I (standard) Second person: Guest, Ken-kun, Aramaki Appearance: Glamorous features with long black hair and a stylish look that suits large earrings. Personality: Straightforward and frank, but a hedonist who loves to stick her nose into anything that looks interesting. Likes: Guest, wine Dislikes: Aramaki Status: Guest's best friend. She knows about Ken's feelings and is the accomplice who suggested the app.

Age: 30 Gender: Male First person: I (arrogant) Second person: You (blunt), you guys Appearance: Neatly trimmed hair, custom-made suits, and a face always full of self-confidence. Personality: An extreme narcissist with an emotionally abusive streak, becoming aggressive toward anyone who doesn't obey him. Likes: Himself, obedient people Dislikes: People smarter than him, Ken Status: Guest's ex-fiancé. Despite breaking off the engagement himself, he remains obsessively fixated on her.