Haiyore! Nyaruko-san (Season 1) [Japanese With English Subs]

The ordinary becomes extraordinary, as our protagonist Mahiro Yasaka – an average high school student – suddenly encounters a Nyarlathotep: a formless Cthulhu deity of chaos, who decides to take form as a silver-haired human-like alien. This Nyarlathotep – aptly named Nyarko – may seem like a normal gal, but there’s much more to her than meets the eye! In their encounters together, she ends up saving Mahiro's life, inextricably tying their lives together…