To be honest, it's very weird.
It feels more like a weird spin-off than a sequel, the art is not really the same as the original (the original was better, I even had doubt it was from the same artist.)
Hime is always smiling, Reiri lost her panty flashing superpower.
The characters progression has been reset to 0 because they all conveniently lost their memories...
One thing didn't change though, arcs still end very abruptly without any real closure.
I just wish the humble bundle had the 6 volumes... it will cost me more to buy the 3 missing volumes than it cost me buying the entire collection.