At Nagisa's school, Seiun Academy, she meets a girl, Yukari, whose father lost her family's dojo to a rogue student. Nagisa offers to help train Yukari to be able to win the dojo back, but Yukari takes a liking to Nagisa in this time.

"Hanya Pyon Comet" strikes Japan, throwing the entire world into a post-apocalyptic state. With the world in shambles, Momoko Priscilla seizes control, with Kamioka as her right-hand man. Nagisa goes missing at this event, and Nosaka is later captured by Momoko, leaving the remaining cast helpless.