A major battle scene which happens after Hoshino goes rogue into the Abydos desert to stop Suou, find, and destroy the Train Cannon at the Valley of Student Council Presidents. Knowing she is the only one capable of stopping Hoshino, Sensei calls in a favour with Hina, who accepts in part to erase the legacy of Gehenna's Tyrant Emperor. The ensuing battle leads to the chapter's climax.
