Like I said, what little plot(or what I consier "plot") has been.
Episode 1: Introduction of characters, Introduction of setting (Children of Enka, family life) a good bit of sillyness.
Episode 2: Tension of being a "family" escalates, resolution of primary conflict(dealing with Yuuka's bullying).
Episode 3: Establishing the Family Members roles, more character exploration, introduction of a new member. Setting the Standard for the rest of the episodes (someone threatens the family, Kyouka yells alot, and then shit fucking explodes) which, I assume, it going to be the standard template for the rest of the episodes.
4-6 so far have been more focused on developing the characters and evolving their relationships than advancing the "plot"(ie, the fact that they're children of Enka). But then, that may just be how I see it I guess...>>12095090
Actually, judging from the dreams he was having, I'm willing to bet the Ouka has alot more in his past than he's let on so far...
Also, while they haven't said it explicitly that I remember, I'm willing to bet that Ouka is a Child of Enka just as much as the rest, and equally possible to be the Destroyer.