I'm not surprised the Kito family is quick to go "We told you so!" in regard to the Great Serpent Lord keeping the volcano pacified with the power of human sacrifice...but Momo is smarter than that. She can read the ACTUAL causation from the legend and knows that the human sacrifice bit is just a piece of @#$%. Now she's going to use the Great Serpent Lord to actually do something actually useful, by throwing its carcass around!
I just love Momo running around town, being chased by the Kito Family, and plugging up the spouting from the hot springs to use to start spewing Mongolian Death Worm slime to cool down the encroaching lava and protect the town. She just looks so cool and so pretty so naturally!
I'm starting to think the Kito Family just have a thing for human sacrifice, it doesn't even matter what they have to worship, the Great Serpent Lord or the "Volcano Lord," as long as they get to sacrifice people, they're happy. Even if it means stopping Momo from actually saving the town.
Lucky Manjiro is there to back Momo up! He even turns out to be a protege of Seiko! Who did the bare minimum of explaining what was going on to him which is why he was spending more time trying to be a Bootuber than actually helping our heroes out. But better late than never.
Dang it Evil Eye! I mean, okay, your beef against the Kito Family is legitimate, but you literally don't care about anything else but annihilating humans. Which means Momo, Manjiro, and Mama Kito have no choice but to do an impromptu team-up to stop him. And even that might not be enough!
But in comes our favorite dance punching Alien Mantis, here to punch out Evil Eye and herald the epic arrival of...Seiko! Who comes in so majestically and heroically standing on-top of a floating Taro as they descend from Alien Mantis' spaceship complete with a theme song sung by none other than lil' Chiquitta himself who is piloting the flying saucer. And Seiko is STILL convinced she's teaming-up with a kappa.
Seiko's got the power of a cigarette and a bat, Taro has the power of the William Tell Overture and to disassemble and reassemble his body! Together they can have Taro form on-top of Evil Eye and seal him up! And then strike a stellar pose once they're finished!
Look at Manjiro, standing up to Seiko for her inability to explain herself well! Even she can respect that.
Really nice of lil' Chiquitta to use the tractor beam to help finish off all the magma!
Of course once everything else is settled, Momo scrambles to go find Okarun...only to find tons of liquid hot magma where the underground sacrifice altar was. Obviously Momo can't fathom a world without Okarun in it, she's even willing to surf through magma if she has to, but luckily with the ingenuity of Chiquitta, Turbo Granny's luck, and Mongolian Death Worm mucus, they're safe! Even if Momo totally forgot about Turbo Granny.
Whether or not they managed to accomplish anything or feel like they failed in saving the other...our favorite duo are just happy that they're both okay and can feel each other, as they fall into each others' bodies. All's well that ends well.