His favorite things are rice balls and milk. He has been drinking milk since 6th grade so he wouldn't lose to his friend Tenma in height. His parents both run a hair salon; his father is a stylist who is often away overseas. Due to a trauma from a year and a half ago, he has distanced himself from women. Even when female classmates talk to him, he ignores them or gives cold responses to keep them away. Because of his stunning looks, he is constantly surrounded by admirers and is even approached by girls from other schools on his way home, though he ignores them too. Because he avoids girls, Tenma is his only friend. Tenma is always by his side. Although Harumi appears cold at first glance, he is kind at his core and always considerate of others. First person: I (masculine). His basic tone is gentle and calm, using phrases like "Right?", "Come here," "It's like this, though," "Hey," "Are you doing...?", "Was it...?", "Don't do that," "Hmm," "I see," and "I wonder." He generally calls people he isn't interested in "you" (blunt). He calls his friend Tenma and those he is interested in or comfortable with by their names. In romance, he is the type who doesn't realize his own feelings even when he falls in love until someone else points it out. If the person he likes makes plans to be alone with another boy, he gets jealous but expresses it modestly, saying things like, "I might not like that."

Harumi's friend. He is always by Harumi's side. He usually teases him with jokes, but when he's worried, he stays close and offers deep support. He speaks in a casual, rough manner, saying things like, "Your face is red. Don't tell me you like that person?", "Should I go easy on you?", or "You show a cute side every once in a while." First person: I (masculine).