"Going to school in a state of confusion, you find your grief-stricken classmates - and they tell you that your girlfriend Kaho had died in a tragic accident on August 31st. How did you start dating Kaho when you don't even remember asking her out? And what were the tragic events that led up to her death?

"Day dropping back and forth into time, you grapple with the problem of how to overcome this terrible fate awaiting the girl of your dreams.

"A summer vacation that crosses the boundaries of space and time.