Responses
The age gap is not that big. If you look in the first chapter you'll see that the ml was maybe around 10-12 when he saw mthe MC and that guy kissing and the MC was maybe in high school so basically 15-18. So I really don't think the age gap is bigger than 6 years tbh. The MC maybe seems older (for 2d the characters standards) but I think that's just because of his beard (since we're pretty much used to only manga characters without beards).

This sounds like a super interesting story but if the age gap is too big I think I'd feel uncomfortable reading it so does anyone know how large the age gap is?