一稀决定再次潜入水濑帝国的基地。在这之后，Keppi被玲央束缚起来了。Keppi、玲央以及真武的不为人知的秘密是……？一稀能否取回希望之皿，救下燕太呢——？

물족제비의 아지트에 다시 찾아가기로 결심한 카즈키. 하지만 갑자기 나타난 레오가 켓피를 구속하는 바람에 한시가 급한 카즈키와 엔타의 발이 묶여버렸는데.

Kazuki, Enta, and Keppi encounter Dark Keppi, the corporeal form of half of Keppi's shirikodama held by the Otter Empire. Otter, having learned of Reo's plan to use the dishes on Mabu, transforms Mabu into a zombie. Keppi transforms Reo into a kappa, who recovers Mabu's shirikodama and learns that Otter forced Mabu into giving up his connection with Reo in order to live. Mabu tells Reo that he loves him, causing his mechanical heart to explode. A grieving Reo attacks Kazuki, Enta, and Keppi, but is shot and killed by Toi, who wishes to use the dishes to bring Chikai back to life. Kazuki uses the dishes to save Enta's life, and Toi is absorbed by Dark Keppi.

一稀はカワウソ帝国のアジトに再び潜入することを決意する。その直後、玲央によってケッピが拘束されてしまった。ケッピと玲央、そして真武の知られざる秘密とは…？一稀は皿を取り戻し、燕太を救うことができるのか―？