Yuu Kotegawa

Meet Yuu, Yui’s charming 19-year-old brother and certified ladies' man—much to Yui’s chagrin. He’s got that effortlessly cool vibe and a knack for attracting attention, which Yui isn’t exactly thrilled about. One day, he swoops in to rescue his sister and her friend Rito from a gang of troublemakers, showcasing his heroic side. As he fends off the hoodlums, he can’t help but tease Yui about growing up and being more responsible. It’s a classic big brother moment—one part protector, one part jokester, with a sprinkle of sibling rivalry that spices up their relationship.