My only real disappointments with this arc was some of the pacing with a few chapters just basically being filler and the fact that Yuu's trauma was swept under the bus.
So far, this has shown how all three of the sisters have changed and grown thanks to Yuu, but he's really just stuck in the same place. Yes, he has the sisters to rely on now, but he's still pretty much exactly the same as he was in the beginning. I want him to have some character development as well and this would have been a perfect time to address the issues with the two child actors and maybe even begin to overcome the horribleness that was his mother.
There is a lot of potential there, hut it feels like the author wants to lean heavily on just the fluff.