There was this one manga I read which I'm sure was an adaptation from a WN/LN. It's about this guy who gets isekai'd to this gal game he was playing, but he's the friend of the protagonist and in the original novel he's this guy who does something to displease the girls and is shunned by the love interests, but of course, he's not the same guy so those change. The MC is really into magic, at the start of the story he says to himself that he'll learn about magic a lot, he also has this scarf that he uses as a weapon. The MC gets adopted and lives with his new step-mother, who is the principal of the school he goes to, and step-sis who works as a teacher, both are love interests, did I mention that there are a lot of love interests? He also gets this robot at a dungeon or something, and she's apparently going to fall in love, maybe. This is as far as I can remember from the time I read that, so if anyone could help, really appreciate it.