I've never ever expected Mima to return before this manga, but she seems to be the most likely culprit imo. Marisa wouldn't have been a target if it was just to replicate the order of incidents, probably.
Ran and Satori both looked fabulous in some frames. The familiars going "PANIK" was fun and Yukari was simply glorious. The way Satori imagined her fainting was hilarious, and so were the cookie stealing and gap shenanigans. Reimu pointing out that Yukari might have let herself be possessed on purpose was cherry on top.
Also, all spirits in the underworld had the familiars' seals floating next to them which looked positively silly lol