I do generally like "what if" story arcs, but at first it seemed that it was only gonna be about Hanako-kun being alive and Nene's classmate. Don't really care about them; it was more of an eye-roll. I don't ship them and don't get how anyone can, so having a whole volume just them dating basically wasn‘t sth I was very eager to get through.

However, as Mitsuba also seemed to be in this world, which made Kou happy, that was more in my interest. I love their friendship so much and it's so great seeing him again.
Although I'm not sure what to think about

Spoiler

him knowing sth about this fake world. Kinda sus. And Tsukasa too knows...? Well, of course he does... He's probably behind this all, isn't he...

I do like the new school mystery – the girl from the art room. As an artist myself, it would definitely be a dream living in this world. You can just make your paintings and drawings become real... Just one swipe and you hold your creations in your hands... *-*

Also, I like how it's kind of breaking the 4th wall with characters questioning things like "we're inside a picture?".