Akira: According to this old relic, it's common knowledge that the snake grows after it eats but dies when it bumps walls head-on. And it is indeed big.
Alpha: Ara, where are you looking at? It seems that a certain snake became bigger than before.
Hours later.
Hmm, iirc, Katsuragi was hiring the group from ch 56 during this time. He hired them because they survived the ruin. Then Akira revealed that they had to be saved by Elena and Sara, making Katsuragi mad.
I guess they skipped this.