In a not-so-faraway future, two friends discover they have been prepping for a doomsday that has already happened.
A woman, who may be the last human on Earth, struggles to survive with only her robot companion. As she battles the harsh realities of her existence, the stakes intensify when her once-trusted robot turns against her.
Sōya Kuroi has dreams of people with superpowers fighting a massive dragon in the sky, but his real life is almost as weird. He's had amnesia for about two weeks and been taken in by a maid and an anthropomorphic cat. When a UFO in the shape of a stuffed bear approaches Sorimasaka City and other metros around the world, he's startled to see seven rainbow-sparkling heroes zoom out to confront it – just like in his dream. Even weirder, the maid wants him to leave his shelter to confront these heroes and take the source of their power.
All hell literally breaks loose on the day that Millennium Demon King gets "resurrected" accidentally by the God of Light. The unfortunate event leads to countless junior demons rising into the fairy world, threatening to destroy the beauty and wonders of many fantasies. In a desperate attempt to rescue the fairy world from the demonic influence and invasion, the Light of God seeks the help of the 12 Zodiac Warriors to protect and preserve its peace.
In the continent of Cruzon, an impending war between the Kingdom of Krisna and the nation of Athens is brimming. The people of this land are able to use quartz for whatever purpose they desire. Yet one person, Rygart Arrow, is not. He is an "un-sorcerer," a person unable to use quartz. But this characteristic will enable him to pilot an ancient Golem, one strong enough to put up a fight against the invading army of Athens.