俺たちが死んだ夏、天使のいた三日間。

"If there were only three days left in the world, what would you do?"

Kousuke was on his loathing daily routine of nothingness when a weird girl that calls herself an Angel appears and tells him those words. Soon after that he decides to go to the sea with a charming girl wearing pajamas on a small trip to escape from reality.