Titre original : Passionate Fight! Gravi Onsen!!
It's generic trip-to-the-hot-springs episode! Raven and Cookie have stayed behind though. At the springs, fanboy service comes fast and furious. Ena is a bit shy, but her towel is taken away anyway. Eiji relaxes in the men's bath when some of the maids enter. In escaping them, he falls over a cliff with only a section of fence to protect him. He ends up turning it into a tobogan. He crashes through the women's bath. Toga joins Eiji, thinking this is a fun game. They end up crashing at the bottom, where Toga ends up on top of G-Force's commander. After getting smacked by her, Toga spies Sandman talking to a man.
Later, Mizuki and Alex are battling Luna and Ena in ping pong. Mizuki and Alex win. Mizuki has a deluxe package ticket, and Sandman shows up, saying it is his. He has Leele battle with him against Alex and Mizuki. Sandman runs all over his oppoents. Ironically, Leele wins it for them. That's when the Zerivire decide to attack. The Zerivire is using the lava of a volcano to charge itself. They have 90 seconds to drag the Zerivire out. To communicate this, Sandman orders the maids to give a karaoke performance. No matter whether you choose English or Japanese, their ability to harmonize is awful. While they sing, the Gravion kicks the Zerivire out of the volcano, and destroys it.
In the end, Raven is the one who gets the special ticket.