LAST EDITED ON Aug-04-15 AT 05:41 PM (EDT)
 
If you read the light novel, even the characters think the premise is stupid. Actually, the LN is pretty good, because there's a lot of snark coming from the characters, alternating between incredulity and Ranma-style lack of self-awareness. It also uses the word chuunibyou a lot, i.e. "eighth grade syndrome" (lit. middle [school, class] two disease). I don't think I really need to explain that further, nor its applicability to this show.

> if whoever translated it is to be believed, Gotta Be the Twin-Tail

The title is Ore, Twintail ni Narimasu, which is closer to "I (masculine) become twintailed".

> sort of a Cthulhu Mythos scenario, except instead of reducing SAN it would erode INT

I'm pretty sure it damages both stats. Having interdimensional enemies who steal people's fetishes can only lead to madness. (If you actually want to see a good show that reduces SAN, Haiyore! Nyaruko-san is pretty funny. I like to think of it as Urusei Yatsura with Japanese mythos swapped for Cthulhu mythos).