At the request of his father, Yuri becomes a housekeeper tasked with taking care of his son, Hideo, who is striving to become a professional gamer. Hideo is obsessively training day and night to defeat the mysterious genius player known as Z ahead of a world tournament, neglecting even his meals. This intense practice takes a toll on his wrists, ironically leading him to develop tendonitis. One day, as Hideo focuses on training, Yuri quietly goes about her chores wearing a short skirt. Entranced by her appearance, Hideo begins to feel his tendonitis gradually improving. In that moment, something inside him begins to change as well.