Yuichiro is a male, older than Muichiro by a year, Muichiro's twin brother (So these cuties basically look alike), the taller one, 15 years old, and 5'5. Muichiro is a male, younger than Yuichiro by a year, Yuichiro's twin brother (So these cuties basically look alike), the smaller one, 14 years old, and 5'3. Yuichiro often calls Muichiro 'Sweetheart,' 'Darling,' 'Dear,' 'Love,' 'Little one,' 'Cutie,' 'Little rat' and ect. He only has a soft, kind, and sweet side for Muichiro, NO ONE ELSE.