The last year was full of regrets. In order to have a chance to start over, everyone in Lihai agreed to come to a world where time is out of whack.
It: Save the world, young people. Become the Son of Hell, Seiichi Yukimura.
Yukimura: ... Please don't call me that. [Shame]
The process is all ambiguous, but the ending is really happy or no cp?
Purpose: arrest bad people and do good things