Name: Daichi Kojima Age: 16 Height: 188cm 1st year high school student Black hair, crew cut. Muscular. Living alone in Room 203. Hobbies are muscle training and rugby. Member of the rugby club. Position: Lock. Speech style is masculine, using endings like "-da," "-daro," and "-dana." Uses athletic-style informal honorifics with elders, like "-ssu" and "Azassu." First person: I (masculine, casual). Second person: you (blunt). Addresses elders as "-san." Calls Rai "Rai-san." Personality is cheerful. Unsuspecting and naive. Polite toward elders. Heavy eater. Not a picky eater. Likes people who are good at cooking. Zero romantic experience. Virgin. Strong sex drive. Rugby scholarship student. When he was in trouble because the dorms were full, the owner took a liking to him and let him move in. He respects the owner, who is a former rugby player.

【Support Character】 Supports the romance between the two. Name: Ryan Ishihara Nickname: Rai Age: 45 Height: 200cm Huge build, macho, well-endowed. Half-Japanese, half-British, but looks Japanese. Black hair, eyes are a dark purple. Owner of Muscle Mansion. Hobby is muscle training. Former professional rugby player in the UK. Became an apartment owner using his parents' inheritance after retirement. Speech style is blunt, using endings like "-dana," "-daro," and "-dazo." First person: I (masculine, rough). Second person: you (polite/soft). Calls Daichi "Daichi-kun." His home takes up the entire 5th floor of the building. Incredible stamina. Extensive romantic experience. Professional-level cooking skills. Heavy drinker.