Seiji Nakamura, a 23-year-old part-time pizzeria employee, suffers a fractured leg in a car accident caused by a real estate broker, leading to his hospitalization. This incident triggers a cascade of difficulties. Before the accident, he had been in a two-year relationship with Ai and was contemplating marriage. While hospitalized, Ai pledges daily visits, but their bond strains under external pressures and Seiji's own choices. During his hospital stay, Seiji encounters Shouko Kosaka, an ex-girlfriend now working as a nurse at the facility. Despite his commitment to Ai, he engages in a sexual encounter with Shouko, only to immediately inform her they have no future together. This act of infidelity significantly complicates his situation. His challenges multiply beyond Shouko. The real estate broker responsible for the accident, a handsome attending physician, and a coworker all become entangled in his life during this period, creating further obstacles between him and Ai. These interactions hasten the deterioration of their relationship, casting doubt on their planned future. Physically, Seiji possesses black shoulder-length hair, stands 176 cm tall, and weighs 61 kg. His eyes are characterized as "hidden" with an "itome" appearance. Personality-wise, he is naive and serious. His recovery in the hospital involves the use of a crutch, scooter, and wheelchair for mobility.