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.

Minako is diagnosed with a brain tumor and doesn't have long to live. She wants to see her twin sister once again, but there are consequences. The twins bring out the worst in each other. Together, they are psycho-pyromaniacs and can be very destructive. There's a reason why they've been separated for 13 years, to protect themselves and those around them. Now, they'll be together again.