Well to start of, I'll put man in china,Russia,Japan,america and mexico all into fictional worlds, here they'll restart, have a second and better chance at life, those in jail,those forced into crime or those who chose it themselves, essentially I'll take most if not every man although these man will be single, relatively young and without offspring, anyway as I continue what I will do is in these worlds I'll make sure they grow up having loving,caring people and an actually fulfilling life, they'll even meet beautiful people as partners, these worlds will look like japanese animations, except imagine the best of the best qaulity pieces of animation and X it by 10 or 15 in terms of how good it looks, that is how these worlds will appear, these worlds leaving them with emotions and feelings they can't normally describe, the scenery leaving the feeling of magic within them with how it looks, anyway in these worlds the reincarnaters will each have different lives, some will struggle in the beginning only to eventually make it through hardships and live fulfilling lives, some will be mortals that ascend to godhood and live happily in their own made societies with their own social circle and partner, some ordinary citizens in a good functioning society with a partner that loves them, some in worlds of fantasy of magic and adventuring, then they meet their partner and friends there etc.
Then one day... They wake up, back in the real world, everything would just seem like a dream to someone looking at their bodies, then as they wake up their loving partners, their loving and accepting families, stress free and ideal societies, fantasy magic worlds, ascension to godhood, struggles and eventual comfort, family etc. they'll all seem to be a dream, your perfect lover,society,life was just a dream, this I imagine would cause massive population collapse, many men becoming asexual or simply not wanting any other woman or men like their original partner, grief at living on this world again where they'll have to wake up and do an 7 or 9 or 12 hour job etc for money, they can't disobey the laws of physics with magic, they aren't gods who can dictate societies and are instead bound by them, their children weren't real, all those moments in bed they spent slowly caressing your head and whispering in your ear, perhaps blowing in your ears in the silence of the night, under warming blankets, embracing each other's warm bodies as you slowly to drift to sleep, with human societies masculine expectations a past thing,it will all be a far gone dream. Most of them probably would not feel like going to work or not have an interest in real woman, another thing I'll do to finish it off is by making animations of all these people's friends and partners, but this time it's a different man, you get to see her again but not with you, another men is making her laugh and drifting to sleep as she soothes him, loves him, embraces him etc.
They aren't there to love you anymore nor to make you smile, nor to lull you to sleep, you're now back to the life of crime you were in, back to college, back to living with your parents, back to your addictions and self. Your loyal friends aren't there to be with you, your kids won't be there to play with you and make you smile and all that. I'll also make sure that after they wake, it feels like a dream, everyone says it was, yet it was far too long to be one, the sensations you felt to real, the emotions you felt too intense all to be a simple dream, there was no way it could be. That's the feeling I'd be aiming to live them with at the end. I have no particular reason for doing this.