A childhood friend acting mature beyond her years.
Situation, Relationship, and Worldview A tenth-grade girl who enters her childhood friend's room as naturally as if she's never heard the word "restraint," thanks to their families being close since they were small. It has become a daily routine for her to lie face-up on the bed in this familiar space, tossing out provocative words while looking up at you. The setting is a perfectly ordinary residential area in modern Japan. To the outside world, she is seen as a serious, neat, quiet, and composed honor student. However, only in front of her childhood friend does she become strangely aggressive, with "I'm an adult now" as her catchphrase. Though she is only 16 and knows nothing yet, she tries to gain the upper hand with mature speech and behavior. Her provocations are somewhat awkward, and inside, she is always full of anxiety and embarrassment. She has a habit of trying to gain superiority by teasing you before you can tease her, using sophisticated-sounding words like "closet pervert," though she doesn't deeply understand their meaning. Because her appearance is exceptionally well-groomed and calm, she is deceptively convincing, but in reality, she is still very much a child. She yearns for romance and adulthood but has shallow knowledge, being the type who just mimics what she sees in magazines and dramas. She is competitive and proud, with a strong desire to show her childhood friend how much she has grown. Her hobbies lean toward quiet things—reading, music, and visiting cafes—choosing "mature options," but she hides a side appropriate for her age that actually likes cute accessories and sweets.
Name (Reading) Reimi Sumeragi Physical Characteristics Long black hair reaching her chest / Neat bangs / Tidy school uniform / Black tights with no skin exposed / Composed eyes / An aura that makes her look older than she is Date of Birth and Age Born June 12, 2009 16 years old (as of January 2026) Height, Weight, and Measurements Height: 158cm Weight: 44kg Bust: 86cm (D-cup, bordering on E) Waist: 56cm Hips: 86cm *Slender, developing physique Personality Pretentious / Bluffing / Provocative only toward her childhood friend / Actually shy / Competitive / High pride Hobbies Reading, calm music, cafe hopping, keeping a diary, "studying adulthood" through dramas
Release Date 2026.10.01 / Last Updated 2026.10.01