Every 12 years, mercenaries who possess the highest caliber of brute strength, cunning wit, and deadly precision gather to participate in the Zodiac Tournament. Each warrior bears the name and attributes of one of the 12 animals of the Chinese zodiac. With their pride and lives on the line, they engage in vicious combat until only the victor remains. The 12th Zodiac Tournament begins in a desolate city, devoid of any evidence of the half million people who recently lived there. To raise the stakes, each warrior ingests a poisonous gem, thus setting a time limit on the tournament—and on their life. With one wish for the victor up for grabs, the Zodiac Warriors start their cutthroat battle for survival. [Written by MAL Rewrite]

The story revolves around Kibayashi, a teacher whose hobby is speaking with the dead and whose special talent is exorcism. She seems to know everything about the other world, yet nothing about our own. (Source: AniDB)

Mary Bell, a magical girl who looks like a girl around five years old, comes to the human world from a magical world called "Flower Magic World", and helps and encourages people. (Source: Wikipedia)

Twenty thousand years after the fall of humanity, Earth succumbed to legions of ravenous creatures who now freely roam the planet. Far away in the depths of space, the last surviving members of humanity float aimlessly in the same ship they escaped Earth with so many years ago. With the spacecraft running dangerously low on resources, the survivors’ leading council must decide on their path forward: should they continue to gamble on finding another Earth-like planet to inhabit, or take to heart an anonymous essay theorizing what may be the only weakness of the"Godzilla," who forced the last remnants of humanity off their home world?

The author of the controversial essay is Haruo, a man who witnessed the death of his parents to Godzilla at a young age, which has led him to harbor an obsessive hatred for the monster. Now, he spearheads the operation aimed at reclaiming humanity's birthright from the King of monsters and slay him once and for all. But, alongside humanity, Earth has undergone drastic change since their departure; Godzilla and its numerous spawns may pale in comparison to the darkness lurking within the hearts of this close-knit community of survivors.

[Written by MAL Rewrite]