Yamada may have moved back home, but she remains at Wagnaria after Otoo and Kyouko allowed her to keep coming in like Takanashi’s little sister to help out, and spending the night there when her mother isn’t home. So in a way, there hasn’t been a major change in the status quo, aside from the fact Yamada is usually going home and is now on better terms with her mom—though not her brother Kirio.
After that Aoicentric episode, this one is more of a grab bag, with a little story involving just about everyone from Otoo reuniting with his wife to Souta having to get a birthday present for Yachiyo (he actually gives her four for the four years he’s liked her).
Many of these stories involve a Yamato in one way or another. Takanashi is annoyed that Kirio is talking so pleasantly with Inami, because he likes Inami, but won’t acknowledge that. He ends up beating Kirio up too much, and must recite a long-winded compliment that Takanashi thinks sounds like a joke, and it’s also how Inami interprets it, embarrassing her. So no real movement there.
In another non-Yamada-related tidbit, Takanashi notices Popura may have shrunk, and Souma confirms she’s lost around 2cm, causing her to become depressed, because as much as she likes being pet by Katanashi, she also wants to grow more, not less. Turns out she actually did grow a centimeter, only because Takanashi grew three, she didn’t gain any ground, causing her to become depressed again.
Back to Aoi, who convinces her mom over a period of six weeks to buy her a cell phone, then sends her mom a text, waits 30 minutes, and gets a blank reply back. Kirio, full of hidden talents, interprets the blank text as a long-winded inner monologue going on in their mother’s head about what Aoi’s original text meant and how best to respond.
Finally, Kirio is sick of Aoi not acknowledging him as her true big brother (thanks to that natto theft incident), so he tries to become her big brother by becoming Souma’s little brother, which he attempts in the most ridiculous, true-to-the-Yamadas manner possible.
It’s actually Souta, whom Kirio asks for advice, who tells Kirio to take this route, in order to best annoy Souma as payback. But it isn’t long before the plan backfires and Kirio is annoying Souta to the point he must retreat from his own kitchen. Don’t get involved with Kirio; it isn’t worth it!