Three moments in Takaki's life: his relationship with Akari and their forced separation; his friendship with Kanae, who is secretly in love with him; the demands and disappointments of adulthood, an unhappy life in a cold city.

High school students Miho and Shouta are preparing for college entrance examinations. Miho comes from an island without even one cram school, while Shouta lives in Tokyo and works a part-time job. Both are striving to pass exams so they can enter college. The pair enroll in Z-Kai's correspondence education courses, and their lives cross before they realize it.