This is a relaxed story but it's not really to my taste. It's pretty much just the typical Japanese isekai MC except there's no harem, and he's not as OP. As another reader said in their review, it's kinda childish. I think it would've been better off if the MC was never an adult in the first place because he can't seem to determine whether he wants to behave like an adult or like a child. Even if he's physically 12, it doesn't make any sense for him to act like that considering he's a grown man on the inside, and also the experiences he's been through. Like he grew up in an abusive home, was married for a period of time, lost his wife in an accident, died a couple years after after being shot. With all these experiences, the personality he portrays doesn't make sense. Also, I don't get why the MC wished to be sent to a place far away from humanity when he isekaied but then the moment he came across humans who were a bit nice to him, he didn't hesitate to become their magical sugar-daddy. That aside, the grammar is really good and I didn't come across any errors that made reading difficult. I just couldn't get into the story. Goodluck with your writing, author.