During summer vacation, when 13 year old Yasaka is staying with his grandfather he encounters a mysterious 16 year old girl Arashi who is actually a ghost from the time era of WWII. Upon contacting Arashi, the two discover they have the ability to travel back and forth in time together all the way back to Arashi's era. However, when 2 other ghosts from the same time, Yayoi and Kanako, appear Arashi's existence slowly starts to fade as they begin to absorb her powers. With Arashi's afterlife on the line, Yasaka will need to act quickly.