Digimon Universe: App Monsters

Haru and Yūjin's Bond - Stop! Rampaging Resshamon! (1x18)

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Haru considers sharing his secret with his best friend Yūjin Ōzora, just like he did with Ai. However, when an infected Appmon hijacks a monorail with Yūjin and Eri on board, Haru and Astra run against time to prevent a tragedy.