Episode 17

"Tell Me Why" is the 17th episode of Kill la Kill.

Plot
After the fight between Ryūko Matoi and Tsumugu Kinagase is dissolved thanks to Mako Mankanshoku and Senketsu, Aikurō Mikisugi explains to her how Tsumugu's sister, Kinu, died in an experiment involving Life Fibers, going on to explain that Senketsu was made with Ryūko's DNA, hence why only she can wear and communicate with him.

Meanwhile, Honnōji Academy makes preparations for The Great Culture and Sport Festival to celebrate Ragyō Kiryūin visiting the school. Learning that this a cover up for a final experiment in which all of Honnō City will be sacrificed to the Life Fibers, Ryūko and the others head for Honnōji, where the ceremony has begun.

As Ragyō begins having the Life Fibers devouring everyone in the stadium, Ryūko and company arrive on the scene. Just then, Satsuki Kiryūin stabs Ragyō and announces her rebellion against her and the Life Fibers, revealing this to be the purpose she has built Honnōji Academy for.

Characters

 * Ryūko Matoi
 * Senketsu
 * Mako Mankanshoku
 * Aikurō Mikisugi
 * Tsumugu Kinagase
 * Kinue Kinagase
 * Isshin Matoi
 * Mankanshoku Family
 * Satsuki Kiryūin
 * Junketsu
 * Ira Gamagōri
 * Uzu Sanageyama
 * Nonon Jakuzure
 * Hōka Inumuta
 * Ragyō Kiryūin
 * Nui Harime
 * Rei Hōōmaru