Sirens awaken the No-Star students for the start of “No-Late Day,” where being tardy will get you expelled from Honnouji Academy. With Senketsu in the wash, Ryuko must fight on her own to get through the Discipline Committee’s traps and arrive on time.

Satsuki Kiryuin joins the front line of Osaka to battle Kaneo Takarada, the heir to the Takarada Conglomerate. Using the influence of money, Takarada rallies the locals to fight, but Satsuki is suspicious there is another power behind the city's defense.