Yū Maeda is Yoshiki Maeda's younger sister, attending second grade in elementary school. She sports brown hair in twin tails and enjoys reading women's weekly magazines while admiring handsome males. Yū holds extensive knowledge about Baramon High School students' personal backgrounds and details. She displays a playful, mischievous attitude toward her brother, often teasing him about his interactions with handsome individuals there. Despite this, she supports Yoshiki in his romantic pursuits. Popular among her own peers, Yū harbors an undisclosed secret. Her character balances nosiness with underlying encouragement within Yoshiki's social dynamics at Baramon High.