It's a Megabrawl (大乱闘じゃんよ Dai Rantō jan yo?) is the hundred forty-seventh chapter of the Dandadan manga series.
Summary[]
Momo yells out to her army to hold their ground as they are being attacked by the opposing armies' beasts but sees from her diagram scroll that at least eighty-four of her fighters have been eliminated, with her group of mages fighting alongside her also gone. Just as a behemoth charges in to stomp her, a motorcycle suddenly slams into it that eliminates the beast and saves Momo. Momo then looks behind her to see the Renjaku high schoolers and Unji's gang charging in to attack. Despite needing to take role pairings into account, Momo becomes amazed by them managing to eliminate the opposing army and beasts without a proper formation, with Unji stating that they are used to getting into fights. While leaving the fighting to them, Momo and Unji head towards the castle to destroy the crystal as per the stage's instructions. Upon reaching it, Momo notices talismans layered onto it and is told by Unji to stand back as he prepares to slash it with his sword. The two then hear Okarun's voice yelling out to them to not destroy it but are too late after Unji completes the task. As he runs up to them, Okarun and the Turbo Granny warns them to run away.