Calvaria vs. Spinthir

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Calvaria vs. Spinthir
About
Arc	Pre-Series
Location	Calvaria
Outcome	Calvaria is victorious
Combatants
Calvaria Yūgo Kuga Yūma Kuga
Spinthir
Triggers
Triggers Yūma's Black Trigger
Triggers Trion Soldiers
Damage Sustained/Casualties
Yūma Kuga severely wounded Yūgo Kuga killed after turning himself into a Black Trigger
Soldiers captured
Chronology
Previous	N/A
Next	First Large-Scale Invasion

The Calvaria vs. Spinthir War, was a war between the countries Calvaria, and Spinthir that lasted at least 3 years and ended about a year before the story began.

Summary

Spinthir attacks Calvaria. With Yūgo and Yūma Kuga's support, things went in favor of Calvaria. However, one day, Yūma disobeyed Yūgo's orders to not fight and went out in battle, where he was severely injured by an unknown party. On the brink of death, Yūma was saved by his father, who sacrificed himself by turning himself into a Black Trigger and replaced Yūma's real body with a Trion Body. After 3 more years of war, the war ended, with Yūma's victory. Since the war ended, Yūma decided to go to Mikado City to find a way to revive his father and restore his body, as well as meet his father's acquaintance.