Ninth has been captured by a cult. The leader is Sixth, Kasugano Tsubaki.
She has a Dead End showing in her diary. She wants to trade Ninth for Amano's help avoiding it. He's dodged two already.
The problem is that Sixth's diary shows what her cult does...
... and they've been hypnotised by Twelfth. Information about the future is worthless if it's false.
Gasai figures it out, but also believes Sixth is poisoning Amano against her.
She give him an ultimatum: come with me and live, or stay with Sixth and die.