With Horizon detained and expected to commit suicide, the students of Class 3 - Plum must decide what to make of the situation. Tensions are sky high, and making the wrong move could spell disaster for Musashi's people.

Futayo continues her battle with Muneshige and arises victorious. Tori makes it to Horizon, but she doesn’t want to be rescued. Tori must not only convince her to leave with him, but also figure out how to defeat the Disintegration Wall.