Yuushin Hirose is a high school student and classmate of the main character. Standing exceptionally tall at 190 centimeters, later growing to 192 centimeters, his height places him consistently at the back of the classroom and creates a noticeable 50-centimeter difference with his eventual romantic interest. He has dark blue hair, taupe-colored eyes, and light tan skin. Outgoing and cheerful, Yuushin is popular and easily makes friends, maintaining a friendly demeanor towards everyone. He occasionally displays irresponsibility, such as sleeping during class or eating lunch in lessons, sometimes causing trouble for himself and others. He engages in playful teasing, nicknaming a classmate "Hiyorin" due to her small stature and chick-like appearance and joking about his homeroom teacher's lack of romantic relationships. Despite this, he consistently shows kindness, particularly in supporting shy classmates. His character development centers on his evolving romantic relationship. Initially slow to recognize romantic interest, he eventually reciprocates feelings for a classmate, entering a confirmed relationship in chapter 23. As a boyfriend, he navigates challenges stemming from his inexperience. His naturally friendly behavior unintentionally causes insecurity, and he experiences jealousy when his girlfriend interacts closely with a shy male classmate. These situations contribute to his growth in understanding relational dynamics and emotional sensitivity. Key relationships define aspects of his interactions: - He shares a childhood history with neighbor Kisaki Tominaga, who confessed feelings but was rejected; their friendship persists but becomes less close. - He maintains a longstanding platonic friendship since middle school with Natsuki Aizawa, characterized by her casual threats when he upsets his girlfriend but underlying mutual care. - His interactions with shy classmate Kou Nitobe are initially friendly but become strained due to mutual jealousy. - He lightly teases his homeroom teacher, Miyoko Mitani, about her romantic life while also showing kindness by rescuing stray cats he later gives to her. Yuushin has no prior romantic relationships before the main series events, despite his popularity and frequent confessions from others, which he consistently rejects politely. A minor personal habit is his loud snoring. His story arc concludes within the original manga run.