English version title - Metal Hot Spring! Ow It's Hot!
Tohru and Mariko reveal that they've started an onsen (hot spring) club together! They invite Netto, Meiru, Chisao, and Rush over for the weekend. However, they have minimal fun with so many strict onsen rules. Meanwhile, Netto meets a woman named Tamako, who's obsessed with net-battles. But they're net-battles keep getting interrupted when Bubbleman attempts to get his revenge against Rockman.
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