OVA of Diabolik Lovers included with the upcoming game Diabolik Lovers DARK FATE.

The premise of the story: "Snatch the rebel elements' secret data using the Surface! There is a leak saying that the giant coporation Ishimiya Industry will commit an act of international terrorism, and Motoko Kusanagi and the Armored Riot Police head out to seize the plug data!" (Source: ANN) A short animation for promoting Microsoft's Surface tablet in Japan.

AD 3567. Mankind has lost its once great civilization, now living in the ruins of the aftermath. But even though their lives are threatened by Gardeners — mysterious unmanned mobile weapons (of different ranks) sent from the Moon — brave teenagers have to become Gardener hunters to earn their living. And although human civilization at large lies in ruins due to high-tech maintenance free technology, some parts of the remaining cities still work in limited ways, supporting the humans living there. One fateful day Tokito Aizawa meets Tea, awakening a power older and beyond that of the Gardeners, and inadvertently opening up the door to a possibly much brighter future for the remainder of mankind...

Koto unknowingly seals away the Sun Goddess Amaterasu, and now she is in a different world and can't return. Meeting priestesses who combat the evil in this strange place she learns that Black Towers throughout the land keep Amaterasu sealed away and are guarded by evil monsters. Koto must now find a way to help defeat these monsters and return the world to the way it was. (Source: ANN)