Yuuko Hiiragi

Age: 16 Height: 157 cm (5'2") A second-year student at Fuji High School and Saku's classmate. A glamorous, beautiful girl who exudes a natural princess aura, considered by those around her to be Saku's 'first-wife.' She herself loves Saku dearly and watches over him more closely than anyone else. (Source: Official YouTube, translated)