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Upon waking up, D-4 knows nothing except for one thing. He should not be alive. Shoved into a job in a city he barely recognizes, partnered with a strange man who holds an inexplicable grudge against him, and caught up in a long-lasting investigation, he tries to find out who he was. And, who he's supposed to become.

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