There will always be a few remarkable memories that is Snow willing to remember despite having the cheat book he purchased in the Black Trade Shop that clearly contains all of his memories in every lifetime.
And in the fifth mission world of Snow, the chaotic and insane situation that his youngest son has caused in the world as being one of it, particularly after being entertained when watching the young man's love story.
As for the cause of chaos, it was because of a special and random task the two young men has to perform every single time they live in a new world, helping a specifically chosen person in their various problems depending on what it was.
Although the one who remembers their memories will be the person receiving the task.