At the end of the previous episode, Mari was airborne; at the start of this episode, there's a rain of abalone (or at least of abalone shells), and Kon mentions only this rain (and not Mari's flight) in reference to Mari's party.
This is so hot. I can't wait for these two to have sex (especially Furuka so I can see her bare boobs and nipples. Bruh I love Furuka's boobs so much).