[Eleutheria]

Side stories:
IMO

They are the various girls' dreams, and the black cat-headed man represents Asakura's point of view in those dreams.

I thought it was pretty obvious...especially in

Spoiler:

the one with the cat-man reviewing previous side-stories in a movie theatre

and

Originally Posted by Esoteria

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FREAKING HUGE UBER SPOILER THAT GOES BEYOND RELEASED ANIME

Spoiler: (Highlight to read)
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Spoiler:

I've read that Sakura finds a way to disenchant the sakura tree that grants all wishes made under it (probably to save Nemu from dying, because Nemu was getting in the way of the promise for Junichi to love Sakura under that tree). This will also disenchant the wish of Yoriko's master to have Yoriko be human. So Yoriko will be a cat again... WAAAAAAAAAAHHHHHHHHHHHHH

If you've seen the h-game CG or played the game,

Spoiler:

There's one pic with Yoriko as the cat crawling out from her clothes