There is a mysterious "time and space rental shop" where you can rent "past time", but you need to exchange it with your most precious things. In order to redeem the male protagonist who passed away due to her willfulness, the heroine rented three opportunities to go back to the past. Each time she could only stay for one hour, and she had to pay a heavier price each time she exchanged the money. She thought that she could retain the male protagonist by changing the key points, but she found that the male protagonist already knew his fate. He "cooperated" with the female protagonist again and again, just to let her learn to let go. The male protagonist also gained the warmth that spans time and space through the female protagonist's repeated visits.
