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It's revealed that Yūjin is actually a robot that works for Leviathan.
He is voiced by Makoto Furukawa.
Yuujin is a teenage boy with fair skin, spiky red hair, and green eyes. He wears a green shirt with yellow on the chest, white on the sleeves and three black lines on the shoulders, greenish grey shorts, dark green socks, and white and green sneakers with dark green soles.
Yuujin is a good friend of the Applidrivers.
Haru, Eri, Torajirou and Rei are attacked by the Ultimate 4, a team of powerful Appmon under Leviathan's that easily destroy both their buddies and AppliDrives. Just as they are about to be killed as well, Yujin and Shutmon appear and face the enemies by themselves to help them escape.
After Leviathan's body was destroyed, Yuujin felt remorseful for his actions and apologizes to the Applidrivers, and decides to delete Leviathan permanently, thus costing his life. In the final episode’s climax, Yujin was brought back to life.