Yagate Kuromaku e to Itaru Saiteki kai

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Description:
Having lost his beloved lifelong master Altesia, Kaltz vowed to take revenge on those who framed her. After making all his preparations, he "returned" to the past. Now 10 years old, and armed with the knowledge he gained in the future, Kaltz begins to operate behind the scenes as the "True Mastermind."...