Black Clover: The Last Hope

"The Last Hope, Gamera. We bestow it to the cradle of time. May he awaken with Gyaos, the Shadow of Evil."

KAIJU CAST
Gamera - Last Hope

Gyaos - Shadow Of Evil

Barugon - Ice Devil

Jiger - Giant Beast Demon

Zigra - Deep Sea Devil

Legion - The Legions

Iris - Evil God

Garasharp - Giant Demon Snake

A Gamera/Black Clover Crossover

Eons ago,
the serpentine Garasharp monsters attacked a highly advanced human civilization. Their four generals convened to plan the creatures' demise, with the general of the south suggesting the use of Mana to create their own race of monsters. With the others' approval, he supervised the crafting of the bat-like Gyaos, which quickly dispatched the Garasharp. Unfortunately, with their food source gone, the Gyaos turned on humanity. The northern general proposed countering the Gyaos with guardians who would each be psychically linked to a human via magatama beads: Gamera. All but one fell in battle, but successfully repelled the Gyaos. Years later, the Gyaos returned, raiding the civilization's city. Worse, a massive Garasharp joined their assault. The last Gamera, bonded to the northern general, chose to destroy both the city and the monsters attacking it, realizing that humanity would never know peace if his creators kept consuming mana. Survivors of the battle memorialized it in a tablet atop the dormant Gamera, with the southern general tending to a mysterious egg.