My Name is Zero.

Summary

In a chilling confrontation, a cold voice mocks the protagonist's attachment to humanity, declaring intent to destroy everything they hold dear. As the protagonist remains calm, they trap the antagonist in an ancient battlefield, leading to despair and madness. Eight years later, a group of young warriors discusses their weaknesses against a powerful level four enemy. They resolve to train hard, entering a modern gym where they push their limits through strength, speed, and swordsmanship training. Finally, they face mutant beasts in the training field, demonstrating bravery and skill as they fight fiercely against the monstrous threats.

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