On the day that Naho begins 11th grade, she receives a letter from herself ten years in the future. At first, she writes it off as a prank, but as the letter’s predictions come true one by one Naho realize...

Poolside. A faint scent of chlorine, with a deep, deep nose. The casual youth and casual days suddenly change the figure. "That day, that morning, my body changed to something completely different." Kei Su...

The big and reliable "beastdog", Pochi, is Takahashi's childhood friend who lives with her. The days they spend together are peaceful and exciting.