Part 12 summary (spoilers, obviously):
The gang looks for Koishi in the popcorn mines, who has kidnapped Nazrin and Wriggle. The gang receives knowledge that Kaguya has planted a Namekian-scale bomb on the moon. Mokou rips off Chiyari's tail, allowing Mima to grow in its place. The team splits during the pursuit with Koishi. Mokou defeats Koishi and rescues Nazrin and Wriggle. Mokou, Nazrin and Wriggle (Team 1) are subsequently blasted to the Dragon Palace. Sukuvan is hijacked by Agent 047 (Team 2), who seeks Sagume in the Bio-Labs to do something about the bomb. Yuuma and the fairies (Team 3) take on the popcorn kaiju rampaging towards the Bio-Labs.
Mokou shuts off most of the power within the Lunar Capital and makes her way to Kaguya. The great showdown ensues. Kaguya employs a lot of stall tactics but without Sukuvan this is just another weekend for the immortals.
Team 2 is in the Bio-Labs. They restore Yuuka and awaken the fairies' waking dream selves back to their proper body. They find Sagume in a condition unable to speak due to her previous injuries. Team 3 takes physical control of the Orbital Slingshot. Sagume writes 047 a multi-pass; 047 may now move with full authorization of the moon.
Team 2 makes way to the Orbital Slingshot. Lunar Control detonates it remotely out of spite. Yuuma downs one of the Kongade Lemon Bappers and launches Sukuvan (crewed only by reunited Yu-Myon and Yu-Youmu) towards the Dragon Palace and into Kaguya, who is held down by Mokou. Kaguya is defeated... and transformed into a baby. I don't have an explanation.
Team 1 is gapped back to the celebratory picnic between the moon rabbits and the rest of the gang. 047 finds and stops the bomb with the help of Okuu. Junko comes to return Sukuvan who only had a 2-year rental agreement. Chimata is gapped in by Yukari and presented an offer by Mokou: treasure from Bishamonten's Pagoda (and no beating) for Sukuvan. Chimata accepts and Sukuvan is now Mokou's.