Hmm, it seems that Erika has grown since the last episode. No idea why they decided to draw her differently all of a sudden. Or why this episode starts with some fanservice shots of her in panties and an open shirt - no bra. Might be rating or BD related.
Anyway, we see how she feeds - conserved blood out of the fridge. Not much style, but I guess it works. ;) Haruna (recuperating) and Kuze (hiding) have been absent from school in the gap between episodes, but right at the beginning we see Haruna going back to it. Kanade is now in the loop as well and says "thank you (for saving her imouto)" to Erika in an emotional way. While Kanade states that Erika is and will continue to be her friend Kuze wanders by in the background. Completely in character she ignores the others greeting her as well as ignoring Iori and Seiichiro a bit later.
After that short scene we get a lot of hinting at future developments - Kuze being the "Dependent" of a certain 'her', which both Erika and Iori know. Additionally Erika doesn't want to see "her" for an undisclosed reason (sounds like dislike) and there was a promise between "her" and Erika.
That conversation is cut short by Kouhei walking in, oblivious of the surroundings. As 'punishment' he and Erika now have to organise the Culture Festival, the largest event at their school. They get some support from the tea group, but most of the work has to be done by them. Like shopping together...
After they're little trip they're relaxing at the beach (later at the bus stop, because it started raining) and Kouhei starts asking about what "Dependents" are. Turns out they form a contract with a vampire by drinking their blood. They do have the physical abilities of vampires, but in return they have long periods of forced sleep and have to follow their masters orders. Kuze's master is not surprisingly Erika and Iori's mother. They made that far to easy to guess, given how much drama they raised around the reveal in the anime.
While Erika is blabbering away Kuze is being escorted to her master, Kaya. Seems they're involved in some game of tag that Kuze is not really liking. She wants to quit the game, but Kayas orders are different and they are absolute.
On the Erika front it is revealed that her mother hates her for not acting like a proper vampire and that she has to make a Dependant before graduation, lest she be given eternal house arrest. No kidding, that's her punishment for failing. Kouhei, being a complete sap, offers to become her Dependant. Erika refuses, because she is scared, wants to be a human and values her friendships more than her true being.
It's also revealed that Iori loves Sister Amaike and that Erika loves Kouhei is now made obvious, for all those that missed it before.
All in all a rather disappointing episode. They led up to a grand finale, but now everything is revealed and the ending pretty much obvious. Completely messed up timing - everything crammed into one episode, with not much foreshadowing or gradual revelations being done.