Hoshino Ame died in a car accident, and Hoshino Haru felt as if the sky had fallen.
The Hoshino family moved away from the place filled with painful memories. Next door to their new home lived two brothers. The older one, Ichijoji Tomo, was the same age as Hoshino Ame.
Just after starting elementary school, Ichijoji Tomo also died in a car accident, and Ichijoji Ken became fixated on the belief that he had caused his brother's death.
In second grade, Hoshino Haru was invited by her older brother's friend, Yagami Taichi, to a summer camp, where she went on a fantastical adventure.
Three years later, the Digimon world was plagued by the Digimon Emperor, and a new group of chosen children appeared.
But there was also a chosen child by the Digimon Emperor's side, repeatedly saving him from danger.
Theme: A childhood-friends story about Ichijoji Ken and Hoshino Haru
