Hiroshige Ushijima is a classmate of Ouri Kagami attending the same school. He persistently pursues female classmates romantically, viewing himself as a natural ladies' man inherently attractive to women. His primary focus is a near-fanatical devotion to pop idol Kun Osaki, though he frequently expresses enthusiasm for other girls. Hiroshige's approach to romance is notably aggressive and intrusive, marked by forward behavior with female classmates; the success of these interactions remains unclear despite his significant self-confidence.

A recurring source of frustration for Hiroshige is envy directed at Ouri Kagami. He observes Ouri effortlessly attracting attractive female peers like new classmate Itsuki Yamagami and the well-endowed Nozomi Kasuga, whom Hiroshige perceives as embodying ideal feminine allure. This envy sharply contrasts with Hiroshige's own perceived lack of success in romantic endeavors.