Episode 24

"Past the Infinite Darkness" is the 24th and final episode of Kill la Kill.

Plot
Ragyō uses the power of her Shinra-Kōketsu to negate the effects of everyone's Kamui and Goku Uniforms. She then revives the original Life Fiber and summons it to Honnōji Academy. In an impressive display of will, Ira struggles to reach Ragyō while carrying his fellow Elite Four members and Mako, but seemingly dies when he blocks an attack from Nui meant for Mako.

Aikuro and Tsumugu attempt to fight Ragyo by combining their DTRs into one mecha, but Shinra-Kōketsu blows them away with ease. Instead, Ryūko steps up to fight, revealing that her combination of human and Life Fiber physiology renders her immune to Shinra-Kōketsu's Absolute Domination. Nonetheless, she is quickly overwhelmed by the empowered Ragyō, leaving the others to despair at the situation.

While Senketsu tries to resist Shinra-Kōketsu's power, he discovers that Satsuki is also capable of hearing him. With Ryūko defeated, Ragyō attempts to fuse everyone into the original Life Fiber, but Senketsu, acting on his own, manages to pierce Ragyō's body and dislodge Rei, restoring everyone's power. As he fuses with Ryūko, Senketsu explains that he is also a human-Life Fiber hybrid, which he realized when Satsuki heard his voice. With their resolve restored, Ryūko and Satsuki each wield one of the Scissor Blades and deal a critical blow to Ragyō.

Meanwhile, the Elite Four lead the charge against the satellite uplink Ragyō needs to engage the final stage of her plan. However, none of them can breach the barrier around the tower, and Nui sends her clones to further hinder their efforts. Suddenly, Ira drops from the sky, having survived Nui's attack by wearing steel armor under his uniform. Transforming into his Shackle Regalia: Persona Unleashed, he tears open the barrier with his bare hands and blasts a hole in the uplink, allowing Aikurō and Tsumugu to destroy it by self-destructing their mecha as it flies into the hole.

Satsuki declares that Ragyō's plans are at an end, but the villainess has one more trick up her sleeve. At her command, Nui decapitates herself and fuses with the original Life Fiber. The combined being then merges with Ragyō, healing her wounds and allowing her to fly into space. Hōka reveals that Ragyō intends to activate the satellite directly, awakening Life Fibers across the planet. As the aliens absorb their human wearers and form a cocoon over the Earth, Ryūko absorbs the combined power of Senketsu, Junketsu, and the Goku Uniforms to form Senketsu Kisaragi, launching into space to face Ragyō.

Mother and daughter begin a furious battle, with Ryūko seemingly unable to defeat Shinra-Kōketsu's raw power. However, Ryuko reveals that she has been willingly taking Ragyo's attacks to provide Senketsu with the power needed to absorb Shinra-Kōketsu itself. Using the ultimate Kamui's Absolute Domination ability, Ryūko commands all Life Fibers across the Earth to release their trapped humans, declaring that "humans are humans and clothing is clothing". With the planet saved, Ryūko asks Ragyō to return with her as a family, but Ragyō destroys her own heart, warning that the Life Fibers will one day return to Earth.

With Ragyō disintegrating into her component Life Fibers, Ryūko prepares to return to Earth. However, Senketsu begins falling apart - the power of Shinra-Kōketsu was too much for even his enhanced absorption abilities to withstand. Before Ryūko can comprehend the situation, Senketsu whisks her back towards the planet, using himself to shield her from the heat of re-entry. As Ryūko protests, Senketsu tells her that she has outgrown him - with the Life Fibers gone, she is free to wear "clothing much cuter than I". Bidding Ryūko farewell, Senketsu burns away completely, with his remaining Life Fibers disappearing in Ryūko's fiery wake.

The grief-stricken Ryūko continues to plummet until Satsuki, Mako and the others work together to arrest her descent. Surrounded by friends, allies, and her sister, Ryūko quietly declares that she is home. With the world freed from the threat of Life Fibers, Ryūko begins a new life with Mako and Satsuki, keeping the memory of Senketsu in her heart as the world moves into an age of freedom.

Characters

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