I have to say about it though; episode 5 (or was yumemi episode 6?) Yumeko - when you are so displeased with someone your animation quality reaches rock bottom, certainly made me shiver there.
I agree that ryota has a strange type of prescence in XX though, in the second game he starts to understand the thrill yumeko seeks in gambling, then, for reasons known only to studio Mappa, falls off the face of the earth until the last few episodes. He could have joined the yakuza and did something far more interesting for all the viewers know