Always loved fairies but thought the manga too boring. With this chapter I just "what the hell has just begun? o_0".
Especially the last page. The mangaka succeeded to max out epicness, cuteness, absurd and fun. And Luna slipped over again.
Anyway, I know how it ends. Larva will beat up the hag. I can feel ZUN wishing to put these two in a vs for a long time.
So, these enigmatic circles in the fields...are just emergency meetup places for fairies. I like ZUN's explications. Honestly.
P.S. Like commentators here too