Episode 18

"Into the Night" is the 18th episode of the Kill la Kill anime.

Plot
After freeing all the trapped students and citizens from the Life Fibers, the Elite Four fight against Nui while Mako helps with the evacuation. Meanwhile, Satsuki reveals how Ragyō had used her in Life Fiber experiments, along with her newborn sister, who was discarded by Ragyō when the experiment allegedly failed. However, Ragyō, who is able to heal her injuries due to her body being fused with Life Fibers, breaks free and takes control of the students, turning them into her personal army. As Aikurō and Tsumugu fight against them, Ragyō takes control of Ryūko, pitting her against Satsuki, but Ryūko manages to break out of it through sheer willpower. Ryūko fights against Nui while Satsuki goes to fight Ragyō, slicing off her head. However, Ragyō survives due to her Life Fiber being unsevered, completely overpowering Satsuki and stealing her Junketsu for herself. As the true nature of COVERS, an army of Life Fiber clothing, appears in the sky, Ragyō rips out Ryūko's heart, which is covered in Life Fibers, revealing her to be Ragyō's daughter.

Characters

 * Ryūko Matoi
 * Senketsu
 * Satsuki Kiryūin
 * Ira Gamagōri
 * Uzu Sanageyama
 * Nonon Jakuzure
 * Hōka Inumuta
 * Ragyō Kiryūin
 * Nui Harime