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Within Thanatos, an organization of professional killers, an elite assassin holds a dominant position due to his exceptional skills. This assassin is also responsible for the death of the protagonist's family. Driven by a vow to avenge his loved ones, the protagonist commits to joining Thanatos and ascending its ranks. His ultimate goal is to confront and challenge the man who took everything from him, aiming for the No. 1 position within the organization.