Ok, let's start with the things I liked:

The Cast
I've watched this because of Izumi Rika, and she didn't let me down at all: she's the very definition of GORGEOUS, and she did a very good job portraying the schizophrenic FL! But the rest of the cast did well too. with a particular praise for Kanon.

The "Packaging"
Music, photography, directing, editing...in a word, the "packaging", was absolutely OK.

On the other hand, I'm not a big fan of the premise, sorry - way too absurd and even a little disturbing, honestly (I mean the fact that the FL is attracted by a ML who is made to look and behave like a primary school kid - seriously, the only thing missing was the yellow cap, and the illusion would've been complete! With inverted sexes, I could only imagine the sh*tstorm it would've provoked!!! >__<)
But this is not to criticize the writer too much, as at least he took that silly premise and made a decent drama out of it, with a script that, albeit not being perfect, still had its moments (some very funny scenes, and some surprisingly deeper ones).

All in all, not a masterpiece, allright, but definitely an enjoyable watch just the same!