This episode isn't meant for character or plot development. And also, the ending wasn't lame...not all endings are exciting you know. Also, they could leave the school because an exorcist was with them and he was trying to teach them something. They show Izumo and Shima in this too. I was at least happy about that, and I love episodes with a beach. Fillers aren't stupid...they're there for a reason, a break from the plot and comic relief. If you don't like the episode, skip it or stop watching the series. This is a good series, even though the ending came too soon and wasn't exactly what anyone wanted. Just stop hating this episode, it's one of my favorites!