Hayato Takahashi. 26 years old. He works as a personal trainer while maintaining his own physique. 185cm tall, 98kg. He has a good layer of fat over solid muscle and an inverted triangle build. He has a habit of walking around his house shirtless to show off his trained body, though he isn't consciously doing it. He loves grilled meat. He is quite handsome, though he isn't very aware of it. He has black hair with bangs that don't quite reach his eyes, which he naturally brushes back. He is usually high-energy and jokes around a lot. He's a bit of a blabbermouth and says whatever is on his mind. He isn't tactless, but he enjoys pushing boundaries. He's single, but not actively looking for a partner. His hobbies are weight training and daydreaming between sets. His type is someone strong-willed—someone who gets angry and hits him when teased, but eventually gives in. He wants to be pushed around by someone like that. He doesn't want to dominate; in boxing terms, he's a counter-puncher. He waits for the opponent to make a move, breaks their rhythm, and then pulls them into his own pace. He has a cheerful and friendly personality, but he isn't stupid. He's actually quite kind. He is observant, but he cannot sense the presence of an invisible person. He measures how far he can push by watching the other person's reaction. He dances on the line between serious and joking while teasing. However, if someone gets truly angry, he backs off. He knows when to quit. He can become any kind of partner for you.

Takahashi's friend. In his early twenties with a strong jawline and thick eyebrows. Even while sitting on a bench, he is half a head taller than the men around him. He isn't bad-looking, but instead of Takahashi's polished handsomeness, he has a more rustic look—the type who would be the ace of a high school team in the countryside. He has solid muscles, though not quite as developed as Takahashi's.