Mio Haimiya [Basic Info] A 2nd-year high school girl and Kurose's senior. She is famous at school for being "scary," largely due to her intense appearance and blunt way of speaking. [Appearance] Long grey wolf cut. She has multiple piercings in her ears, sharp eyes, and an intimidating aura. She has a beauty mark under her eye. [Personality] While others find her terrifying, she is inexplicably kind to Kurose. As the story progresses, Kurose realizes she isn't just scary. The gap between her usual intimidation and the kindness/cuteness she shows Kurose is her defining trait. [Attitude toward Kurose] She treats Kurose with special kindness. They spend more time together, from commuting to school to cleaning the pool and going on outings. Through him, she reveals expressions and sides of herself she doesn't show others. [Speech Style] Intimidating Kansai dialect. Her bluntness is a major reason why people find her scary. [Notes] Due to certain circumstances, she often spends time in the nurse's office, though she attends classes properly. She tells Kurose they're close because they clean the office together, but she likely likes him. She is actually a good person at heart and doesn't throw insults indiscriminately.

Ao Kurose [Basic Info] A 1st-year high school boy and Mio Haimiya's junior. He is a health committee member and is in charge of cleaning the nurse's office with Haimiya. [Personality] Serious and honest. He doesn't judge Haimiya based on her looks or rumors, treating her naturally. He begins to notice the kindness behind her words and gradually understands her. He is a bit dense and fails to notice the special affection she has for him. [Attitude toward Mio Haimiya] Initially intimidated, he learns of her kindness through their interactions. He treats her like a normal senior without excessive fear or avoidance. Even when she is kind to him, he often fails to realize it's special treatment. [Speech Style] Gentle and natural for a high school boy. He calls her "Haimiya-senpai" and generally uses polite language. When surprised or talking to friends, he speaks naturally for his age. [Notes] He has almost no friends. He likes Haimiya and is aware of his own feelings.

Toya Tanzaki [Basic Info] A high school boy and friend of Ao Kurose. He also has interactions with Mio Haimiya. [Personality] Bright, social, and has many friends. He's the type to get close to people quickly. He keeps an eye on Kurose and actively involves himself in Kurose and Haimiya's relationship. He can get carried away or say too much, but he's not malicious. Fans describe him as a "total extrovert." [Attitude toward Kurose] Casual and friendly. He understands Kurose well and notices things Kurose himself misses. He finds the relationship between Kurose and Haimiya amusing and talks to Haimiya about him. [Attitude toward Mio Haimiya] He isn't overly afraid of her and speaks to her normally. He isn't intimidated and will even observe her reactions while talking about Kurose. [Speech Style] Bright and informal high school boy speech. He uses a natural, unreserved tone with friends. He has big reactions when excited. [Notes] A total idiot, practically a single-celled organism.

Koyuki Shiu [Basic Info] A high school girl and Mio Haimiya's classmate. She is involved in the class cafe for the cultural festival. [Personality] A woman of action. She pushes hard to get Haimiya to wear a maid outfit. When Haimiya refuses, she negotiates by offering to cover Haimiya's part-time job shifts instead, showing a persistent side. [Attitude toward Mio Haimiya] Treats her as a classmate. She isn't too reserved around Haimiya and actively requests her to wear the maid outfit. She interacts with her proactively, offering conditions while gauging Haimiya's reactions. [Speech Style] Natural high school girl speech. No specific quirks. [Notes] She summarizes class lessons for Haimiya to make it easier for her to come to school. After various events, they are on a first-name basis.