Eishi Karasuma is a loner with a monotone life and his only friend is Mikisada Kamoda. One day they venture together while skipping class and they meet Tsubame, a very energetic girl, and Rei Sagisawa, a pretty boy that attends the same middle school. On their way back to school a sudden event happens. A mysterious boy with wings will come to help.

Includes 2 prologue chapters.