This book is also known as What Happens When the Date A Live Crew Collides with Ultraman and Kaiju Girls? This is a heavily modified Date A Live fanfic that radically alters the original setting. You'll see familiar faces as well as plenty of new ones, storylines unrelated to the original, and lots of homages.
Now for the familiar, completely straight-faced nonsense: Thirty years ago, Nidhogg, the calamity dragon who coveted the power of the World Tree, led the Cult of Calamity Dragons in an invasion of Earth.
The seven elemental holy beasts who should have protected Earth were corrupted by the dragon's schemes and became Demon King Beasts.
In the end, Nidhogg and the seven Demon King Beasts were sealed away by a Giant of Light, the incarnation of Earth's will, at the cost of its own life.
Thirty years later, the remnants of the Cult of Calamity Dragons regrouped and launched another attack on Earth, and humanity rallied to fight back.
At the same time, what kind of entanglements will arise between humanity and those who come from the universe, bear the guilt of calamity, inherit the will of a planet, and shoulder a mission?
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