To be honest all of the girls are just too young for him.

Fr, they're quite too young for him, like they could literally pass as his daughters, but I don't have a problem with age-gap romance—only that it happened too suddenly. Like out of nowhere, she just decided to do it with him—girl! Are you serious? And the guy just tolerated it lol. I can overlook that part pero as the chapter progressed I sensed other sexual romantic tension between him and other girls, and slowly it became apparent na magiging harem talaga siya, so yeah sayang... akala ko pa naman na magiging wholesome and funny isekai adventure siya, but then I can see that it will add to the growing number of isekai with unnecessary harems..sigh...