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Kai Aoki is an ordinary high-school student living in a modern city with his mother and younger brother. Quiet and withdrawn, Kai believes his greatest weakness is always being too late. That belief becomes a painful reality the night he fails to protect the person he loves most. Consumed by guilt, Kai is drawn into the hidden darkness beneath the city, where he encounters an ancient demonic entity. Desperate for the power to protect others, he accepts its offer—sealing a Black Oath,

This series is rated Young Adult. Please review the Content Ratings page for more information.