Digimon Universe: App Monsters

Dive into the Sea of Net! Chasing to the Super Hacker, Rei! (1x11)

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Chasing after Rei in order to rescue the Seven Code Appmon he stole from them, Haru and his friends come across Sakusimon, another of Leviathan's agents, but are rescued by Rei, and learn the reason why he is gathering the Seven Codes for himself.