On Christmas Day, Sunohara Nozomu finally told his childhood friend Takanashi Shiori how he felt — and she felt the same way. They spent winter together, passed their entrance exams side by side, and enrolled at the same college. Now summer break stretches out before them: the first two full months they have ever had to spend together without school as a framework. Neither of them has experienced a summer vacation with each other before. Nozomu has already started making plans.