I missed this thread.
It is very a fun episode. In fact the funny part isn't about the girls but
Spoiler:
The culprit who installed something to peek at girls ended up being peeked himself. ouch!
The effect of looking at wrong stuff hurts badly to the extent of the rolling down of shutter
I like how the girls get together and the guys as well. Mirajane is the only fanservice the guys get.
Nice touch of comedy and drama about the old lady.