Chikuma Tanesato

Tanesato Chikuma is a relative of Mizuto, known for being extremely introverted and rarely speaking up on his own. He typically spends most of his time absorbed in his handheld video games. Making his appearance during the family homecoming arc, he initially kept his distance from Yume due to his shyness, but gradually opened up as she patiently reached out to him—eventually developing what can only be described as a first-crush-like admiration for her. His resemblance to Mizuto led Yume to nickname him a "mini Mizuto," and he serves as a supporting character who indirectly highlights the dynamic between the two main leads.