Yuggoth Attacks!
Nyarko is usually happy and hyper, but she's caught a cold and is stuck in bed. Nyarko is smitten by Mahiro, who's being a little nicer than usual. It's then that they get a report that an intruder has shown up at the North Pole. They leave Nyarko behind to recover and find that Mi-go was waiting for them...
Aired 17/06/2013EP 10 - Yuggoth Attacks!
2013
Nyarko-san: Another Crawling Chaos W
Nyaruko still wants Mahiro, as does Hasta. Cthuko wants Nyaruko, but believes both Nyaruko's and Mahiro's "first time" belongs to her. Mahiro's mother, Yoriko, puts up with all of it and cheerfully runs the house where they all live. Mahiro just wants some sanity. He doesn't want to be the love toy of a Nyarlathotepan, Cthughan, or a shots-like Hasturan. He may or may not hold out.
(Source: Anime News Network, edited)