—King's Tide Spoilers— The Hexsquad is stuck on Earth and have to wait for someone to make a portal to rescue them. So, they might as well have some well needed downtime after all that happened.
It's post Hollow Mind, you know what this is about.
So what if Hunter met Caleb? (let's just assume that Phillip's brother's name is Caleb because that makes sense)
Dipper has to sacrifice himself to stop Bill. As it turns out, using the memory gun on a still-developing brain has more side-effects than using it on an adult's brain. Now, Mabel not only has to help Dipper regain his memories, but has to help him cope with all the other problems that come with having your entire mindscape erased. Not really any plot, just angst and fluff.
Dipper and Mabel's summer is over, yet they wish it could never end. After all, it's going to stick with them forever… even the bad parts. Especially the bad parts.