Eri got invited by Unryuuji Knight to his luxury boat. However she finds out Knight is working under their enemy: Leviathan. Eri rejects Knight's offers to turn her into the best idol with Leviathan and his power, and dives into the ocean. She's rescued and reunited with Haru and co who came to save her. However, Haru and co are attacked by Karisumon of The Ultimate Four.
Haru and Co's Applidrives are destroyed from the attack of The Ultimate Four. They have to accept the reality of Gatchmon and others are no longer here. Haru is thinking about what he can do to bring him back.