It doesn't really make any sense for him to be this dense. Like, earlier when he was hugged he thought about the possibility that Akira likes him, so it's not like he can't imagine the concept. And he has no traumatic events in his past that'd undermine his self-esteem or doubt his self-worth. Maybe he's not like super handsome, but he's super fit, great at all sports, smart enough to place second in his year on final exams, super nice, very bold and extroverted, etc., so it's not at all strange that multiple girls are into him, and he really ought to be aware of this at this point. As in most harem romcoms, it's like it'd just end too soon if the MC wasn't dense, but I wish authors would find some way to drag things out that just doesn't make no goddamn sense at all.