In the year 295 of the New Calendar, a meteorite fell from the sky and brought mutant genes.
Since then, the world has plunged into endless chaos and pain.
How can two helpless girls survive in such a world? You can only hold the other person's hand tightly.
Betrayal, killing, endless.
[As long as you are here, I will never let go and I will never leave you.
I will never... Let you be alone