Yusuke Mizusawa is a male teenager characterized by gray eyes and gray hair cut to ear length, fitting typical teenage designs in his medium. He accepts a role as private tutor for a girl named Reina, motivated chiefly by her physical appearance. This choice triggers a central conflict where Reina and her mother vie for Yusuke's attention through escalating sexual advances, sidelining academic goals. The tutoring arrangement devolves into a vehicle for their intense sexual rivalry, casting Yusuke as the contested object of their competition. His documented role centers entirely on this dynamic, without expansion of his background or personal evolution. Yusuke's interactions consistently drive comedic and erotic tension from this conflict, with no deviation into other narratives or character development.