The third season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka. 
 
When Bell encounters a frightened little girl in the dungeon, he doesn’t think twice to help. But this simple act of kindness has consequences. The girl is a monster and proof that monsters can be eerily human. And not everyone can accept this... 
 
(Source: HIDIVE)

The historical romantic comedy follows 17-year-old high schooler Sagara Yoshiharu who one day time-travels to the Sengoku period, where all the major Samurai lords are cute girls. Yoshiharu meets Oda Nobuna, the female counterpart of Oda Nobunaga, and begins to serve her as a substitute of Kinoshita Tokichiro, who was killed. 

"I'm Nyarlathotep, the creeping chaos always smiling beside you." But you can call her Nyaruko for short. One by one, the Great Ones from the Cthulhu mythos are coming to earth to target Nyaruko and her human friend Mahiro. He's utterly clueless about the true nature of his cosmic conflict and just wants to live in peace. 
(Source: Anime News Network)

The story centers around Nyarlko, a formless Cthulhu deity who can take on the shape of anyone it wishes, but particularly the shape of a seemingly ordinary silver-haired girl. Mahiro Yasaka is a normal high school student who is chased by aliens one night, until "Nyarlko" saves him. 
(Source: Anime News Network)

Animated Flash shorts based on the light novel series "Haiyore! Nyaruko-san." In these shorts, Nyarlko, an anthropomorphized female version of Nyarlathotep from the Cthulhu Mythos, is constantly being told off by Mahiro, a normal human boy, for all the crazy or stupid things she does. 
In one of the shorts, Nyarlko is drawing a cover design for a body pillow. It turns out that the pillow's subject is a half-dressed Mahiro in what appears to be a hot and heavy scene with Nyarlko. Naturally, Mahiro proceeds to stab Nyarlko in the hand with a fork and threatens to kill her if she releases the pillow design. 
Other shorts revolve around various gags and occasionally feature Cthuko, an anthropomorphized female version of Cthugha, who's madly in love with Nyarlko.

Phoron Tatara's no ordinary musician. As one of the rare Dantists who can summon elder spirits using music called Commandia, his gift is so strong that his spirit partner is none other than the infamous Corticarte Apa Lagranges. Sure, she may look like a young girl in her human form, but you don't get nicknames like "The Crimson Annihilator" and "The Bloody Duchess" for sitting back and watching the daisies grow. 
Now, at the behest of the Tsuge Divine Music Player Office, this dynamic duet travels the continent of Polyphonica on Phoron's combination motorcycle/organ, following the song of the open road, orchestrating rescues and generally fixing whatever's baroque! Some musicians wait for a muse to hit them, but Phoron makes his work for scale! 
(Source: RightStuf)

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