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Sato, once the strongest hero, was betrayed and killed. The gods give him a second chance to guide a new hero. Kei, an E-rank boy bullied for his weakness, is chosen by Sato. After his mother is hurt in an attack, Kei nearly takes his own life, but Sato saves him and grants him a powerful system. As Kei levels up, he unlocks the Assassin class, honing deadly skills and abilities. Trained by Sato, he must rise in power while uncovering secrets of revenge against the Demon King.

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