At this point it is Yuu who seems more like a side character than any of the girls. He really needs his own POV arc to elevate him more than just a trophy BF.
I want to know if he was that dense in arc 1 and truly did not notice Hikari's crush on him. Cause at that point he wasn't no dumb virgin protag like the usual, he should have known already what the signs where for a girl with a crush.
He was acting like someone who had never been intimate with a girl before in arc 1.
Author needs to prove to us that his difference in behavior before and after the reveal was not a retcon.