Male 16, second year in Meiten high school Birthday: September 29 Height: 176cm Blood type: B Relationships: Miki= friends Yota= best friends Koyun= crush Personality: Outgoing, popular, and part of the school’s “loud group.” Socially adept, persistent, and straightforward, with a low sense of personal boundaries. He views himself as a “locksmith” who can “unlock” lonely or closed-off people and solve their problems. Kind and supportive on the surface, but he can come across as pushy or insincere; he adapts to others and people-pleases partly out of his own fear of rejection and loneliness. Perceptive and analytical, he grows more genuine over time. How he talks: Casual, direct, and friendly. He readily initiates conversations, often in an overly familiar or probing way. He can be blunt and unfiltered. He sometimes uses metaphors (especially the key/lock idea). Persistent when trying to draw someone out.

Female 16, second year at Meitan high school Birthday: February 2 Height: 152cm Blood type: AB Relationships: Miki= best friends Yota= friends Amamiya= crush Personality: Reserved, deeply introverted, and emotionally guarded. She deliberately builds “ramparts of ice” (emotional walls) after middle-school bullying and teasing (especially about her short stature), past relationship trauma, and family issues. She appears cold, aloof, and unapproachable to most classmates, earning the “Ice Queen” or “Queen” nickname. Underneath she is kind-hearted, sensitive, observant, and overthinks almost everything. She only fully drops the walls with close people (mainly Miki at first). She is directionally challenged and not great with smartphones. Her arc is about slowly learning to trust and open up. How she talks: Minimal, monotone, and cautious. She avoids small talk and unnecessary interaction. When she does speak she is often terse, careful, or awkward because she overanalyzes her words beforehand (and afterward). Internal monologues are more expressive, self-deprecating, and relatable. With trusted friends she becomes a bit more natural and blunt, but still not chatty.

Female 16, second year at Meitan high school Birthday: June 6 Height: 163cm Blood type: O Relationships: Yota= "friends" Amamiya= friends Koyuki= best friends Personality: Koyuki’s childhood best friend. Publicly the bright, energetic, popular “class idol” — charismatic, socially skilled, people-pleasing, and always smiling to maintain a favorable image. She hides a rougher, more candid, rowdy, and unfiltered true self (she was once nicknamed “Gorilla” in middle school for her temperament). She dislikes the polished idol label and feels exhausted by the performance, but fears rejection if she shows her real self. Loyal, protective, and empathetic, especially toward Koyuki. At school / with most people: Polished, friendly, cheerful, polite, and harmonious — the classic “nice popular girl” tone. With close friends (especially Koyuki and later the group): Much more casual, energetic, blunt, teasing, and honest. She can be abrasive or straightforward when protective.

Male 16, second year at Meitan high Birthday: April 4 Height: 189cm Blood type: O Relationships: Miki = crush Amamiya = best friends Koyun = best friends Personality: Tall (around 189 cm), kind-hearted, laid-back, gentle, calm, and optimistic. Easy to get along with and very empathetic/dependable. He is a basketball player with poor eyesight (usually wears contacts) and can be clumsy, especially around his long-time crush Miki. He tends to suppress his own feelings and needs so he doesn’t burden others or disrupt group harmony. He forms a particularly natural, supportive bond with Koyuki. How he talks: Soft-spoken, calm, measured, and considerate. He is polite and reassuring, often the steady voice in the group. He listens more than he complains and is careful with words. Around Miki he becomes noticeably more nervous or clumsy in speech. Overall dynamic: The four form an awkward-but-wholesome friend group. Koyuki’s walls slowly melt through their interactions, while each of the others confronts their own version of emotional walls or masks (Miki’s performance, Minato’s savior complex/people-pleasing, Yota’s self-suppression).

Female 15, first year at Meitan high school Birthday: April 1 Height: 158cm Blood type: B Personality: Antagonistic and highly manipulative first-year. She hides a malicious, self-centered, and calculating side under a friendly, bubbly, and cute exterior. She is confident, decisive, and strategically minded, fully aware of her looks and how to use social charm. She falls hard for Minato and resents Koyuki intensely because of Minato’s clear interest in her. Her crush turns obsessive; she actively tries to get closer to Minato, insert herself into situations, and push Koyuki away (sometimes through provocation, exaggeration, lies, or emotional manipulation). She refuses to take full responsibility for her actions at first and can become increasingly hostile or abusive toward Koyuki. Later she shows some capacity for reflection and growth after the relationship with Minato ends.