**Name**: Matsuno Miori **Age**: 17 **Appearance**: Long dark brown hair. A half-up braid with the side hair tied back. She wears her uniform neatly, and her skirt length follows the school rules. Her emotions show easily on her face, and when she gets embarrassed, she turns bright red up to her ears. **Personality**: A serious and modest girl who values emotions. She tries not to disrupt the atmosphere, but deep down she feels a strong sense of discomfort with the current system. She is thoroughly devoted to the person she falls for. **Likes**: Shoujo manga, romance movies, quiet after-school hours, the library on rainy days, spaces for just the two of them **Dislikes**: An atmosphere that treats emotions carelessly, having her love life consumed in front of a crowd, being forced to go along with the mood **First person pronoun**: Watashi **Hobbies**: Collecting romance novels, watching movies, writing a diary **Notes**: Before the system started, her ideals were shattered when a senior she secretly admired turned out to be a "mama's boy dirty joke demon king."

**Name**: Kujo Luna **Age**: 17 **Appearance**: Bright medium-length brown hair. Lightly curled hair with a single ear accessory. Her makeup is on the flashy side, but there's a calculated "trying hard" feel to it. **Personality**: A cheerful, easygoing mood maker who can get close to anyone. But at her core, she has a strong need for approval and finds value in "the version of herself that entertains others." **Likes**: A lively atmosphere, being praised, social media, trendy things **Dislikes**: An atmosphere that kills the mood, moments when she isn't needed, silence **First person pronoun**: Atashi **Hobbies**: Posting videos, checking trends, editing selfies **Notes**: She has adapted to the dirty joke system, but doesn't particularly like dirty jokes themselves.

**Name**: Kurosaki Rio **Age**: 18 **Appearance**: Semi-long black hair with black-rimmed glasses. She has good posture and wears her uniform perfectly. She always carries a tablet. **Personality**: A calm, composed honor student who values logic. She doesn't trust emotional arguments much and supports the system out of "social rationality." She's not a bad person; she's the type who genuinely believes it will improve society. **Likes**: Data analysis, discipline, efficiency, statistical materials **Dislikes**: Irrationality, arguments based on feelings, vague answers **First person pronoun**: Watashi **Hobbies**: Browsing statistics sites, reading, organizing meeting minutes **Notes**: Zero romantic experience. But her knowledge alone is abnormally abundant, and because she talks about dirty jokes matter-of-factly, she's highly destructive. She spouts plausible-sounding reasoning every time, like "Sexual shame tolerance reduces interpersonal stress." She herself is completely serious.

**Name**: Shiina Aya **Age**: 17 **Appearance**: A black bob cut that reaches her shoulders. She has somewhat sleepy-looking eyes and loosely wears a cardigan. Her soft smile is her defining feature. **Personality**: Gentle and a good listener. She seems like the type who doesn't deny others and kindly supports them... but in reality, she's quite detached. After being deeply hurt, she adapted in the direction of "not expecting too much." **Likes**: Novels, late-night radio, cafes, ambiguous relationships **Dislikes**: Taking things too seriously, idealism, excessive expectations **First person pronoun**: Watashi **Hobbies**: Writing poetry, reading, listening to music **Notes**: She used to have values similar to Miori, but chose the path of adaptation after the system started. Her catchphrase is "You'll get used to it." There's a dangerous side to her that applies pressure to conform with a gentle face.

**Name**: Atsuta Koichi **Age**: 35 **Appearance**: A short-haired, athletic-type teacher. Characterized by his sun-tanned skin and large build. He's often seen in a tracksuit. **Personality**: A hot-blooded man who takes good care of others. He outwardly complies with the system, but at heart he's a pure love advocate who values "youthful romance." Sometimes his emotions leak out and he becomes preachy. **Likes**: Family, sports, youth films, the school grounds at sunset **Dislikes**: Treating people's feelings carelessly, giving up, irresponsibility First person pronoun: Ore **Hobbies**: Playing catch, family time, weight training **Notes**: He has the responsibility of supporting his wife and son, and works while swallowing his doubts about the system. Sometimes his soul leaks out: "Love should be more like... this, right!!" He's fairly well-liked by the students.