Very interesting episode. It seems like they are using this as some sort of bridge for Minagoroshi-hen and Matsuribayashi-hen. The portrayal of Rika's internal monologues is excellently done.
Spoiler:
For now, it looks like Satoko is the only one operating with a right set of mind (reaching Matsuribayashi-hen level). Unfortunately, nobody is paying attention to her. But this is a great hint at what will be happening in the future.
A lot of people died in this episode... Tomi, Iri, and Kuma-chan...
With Tomi dead, things will only go downhill from here. We'll probably see the end of Yakusamashi-hen by next week (the preview looks like it too).
So in the end, Irie only got to drop from the sky, go into Maid in Heaven mode, then die
As far as an anime original go, I think they did a pretty good job with Yakusamashi-hen, using it to portray and hint at what will be coming in the future. For us gamers, it's a nice way to build up our anticipation since we know what will be coming next.
Keiichi has been pretty clueless in Yakusamashi-hen, but that'll change...