Digimon Universe: App Monsters

Take Back the Gatchmon! Grandpa Den'emon's Trial! (1x38)

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Haru is contacted by his grandfather, and guided by his instructions, he and the others reunite with their Appmons, who do not remember them at all, and are sent to a journey to restore their buddies' memories. In the occasion, they not only reconnect with Gatchmon and the others, but obtain each one their own AppliDrive DUO.