This is when the shoe drops. At least the first shoe. Aya tries to make Nanako give up her Sorority candidacy by being like, "HURR, I DUG INTO YOUR FAMILY BACKGROUND AND YOUR DAD ISN'T YOUR REAL DAD BECAUSE YOU AREN'T BLOOD-RELATED AND HE MARRIED YOUR MOM WHEN YOU WERE FIVE. ONLY BLOOD TIES MATTER YOU DON'T EVEN KNOW WHO YOUR REAL DAD IS, BASTARD CHILD, HRAR GARPH I'M GONNA PUT THIS INFO ON FLYERS AND LITERALLY THROW A MILLION FROM THE SCHOOL CLOCK TOWER SO EVERYONE AND THEIR GRANDMA WILL SEE THEM."
Kaoru rips off the flyer Aya pinned to a bulletin board in a hallway in a scene that reminded me of Utena getting pissed about what Saonji did with Wakaba's love letter, but yeah, only so much you can do when Asshole McAsshat wants to throw gossip confetti from the top of the school.
I love that Kaoru not only tore off the flyer, she said that before tossing it at Aya.
Btw, this series emphatically does not do what Usagi Drop and a horde of other manga and anime titles have done by negating family relationships between people who aren't blood-related- Tomoko points out that Nanako's father, the man who raised her, is who she loves as her father, so he is her father, period.
Mariko's attachment to Nanako is helpful instead of weird right now, because she goes all Mama Bear and tells Aya and the other bullies to fuck off in a slightly more polite way than I would when they try to intimidate Nanako.
Mariko helps again by saving Nanako from having her Sorority chances ruined completely by a scheme of Aya's, and the episode ends with the question of how Nanako can salvage her chance of becoming a Sorority member after being over two hours late to the Sorority selection party.
On a more flippant note, I like that so much of Nanako's bonding with Tomoko is over baking and sweets,