It starts really well: "ah I'm an isekai! I could be a simple fantasy, but no, I decided to be an isekai. How will this impact the plot? In any way, the protagonist doesn't even remember his past, but he knows he is in an isekai. Not like breaking through the fourth wall, we just bothered to describe his life and his personality. So... Who cares?! He is cool and strong. When you have all that coolness, what personality do you need? ". 10/10