Mahiro Yasaka is just an ordinary high school student, until one day he is suddenly attacked by a dangerous monster. Just when everything seems to be lost, he is saved by a silver-haired girl named Nyaruko, who claims to be the shape-shifting deity Nyarlathotep from horror author H. P. Lovecraft's Cthulhu Mythos, sent by the Space Defense Agency to Earth. She explains to Mahiro that the creature chasing him was an alien called Nightgaunt, who had planned on abducting and selling him as a slave. After rescuing him from the alien, the Lovecraftian deity falls madly in love with Mahiro and forces herself into his household, much to his chagrin. Moreover, they are soon joined by two others from the fictional universe: Cthuko, a girl obsessed with Nyaruko, and Hasuta, a young boy easily mistaken for a beautiful female. Together, the three eccentric aliens protect Mahiro from the various extraterrestrial dangers that threaten both his and Earth's well-being, all the while making his life a living hell. [Written by MAL Rewrite]

Nyaruko still wants Mahiro, as does Hasuta. Kūko wants Nyaruko, but believes both Nyaruko's and Mahiro's "first time" belongs to her. 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: ANN)

At the onset of World War III, nobody could have predicted the effect it would have on Japan. While it had officially ended fifty years ago in 2150, its battles still persist. Large, mysterious areas known as "Blackspots" appeared across the country, filled with the contaminated ruins of cities and countrysides. Those inside were trapped to halt the spread of contamination, and their powers began to mutate—be they shapeshifters, pyromancers, or controllers of gravity itself—they all became known as the Needless. Adam Blade is one such Needless, possessing remarkable regenerative abilities and incredible strength. In order to restore peace to a war-torn Japan, he and his allies must fight together to rise against a heinous research group by the name of Simeon.

Saint Lily Gakuen no Himitsu episodes bundled with the Blu-ray editions.