After the revolutionary war, Tatsumi was able to survive the fight with the emperor. No longer willing to stay in the Empire after seeing so much death, so he leaves in search for a new start in his life, and this journey starts with a girl named Ry...
After the events of the school raid, Satsuki was taken back home by Nui who posed as her helicopter pilot. After she was taken back home, she was "purified" by her mother Ragyo Kiryuin. And then taken to where everything began, the source of the life fibers.
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Satsuki: This is the origin of power?
Ragyo: Yes, this is the beginning of it all. The Primordial Life Fiber. This glowing ball of thread drifted through the stars and then finally made its way to Earth. The second that happened humanity was doomed to serve clothing for the rest of eternity. Life Fibers will cover this world through clothing. They are COVERS and nothing in this world can compete with them. That was until a beast was born. The tyrant, Incursio was the only creature on this planet that could compete with the Life Fibers due to its constant evolution. That was until one day it was slain and transferred into a sword and even still it continued to devour any humans who were stupid enough to use it. Until you, Tatsumi of Night Raid.
She then picks up the Incursio from underneath her cloak and smiles.
Ragyo: La Vie Est Drôle (Life is amusing)
Satsuki: If you don't mind me asking. Who exactly is Tatsumi?
Ragyo: Tatsumi was a member of a group of infamous assassins called Night Raid who worked against the Imperial Empire, a great ally of the Kiryuin household. It's funny, isn't it? He who fought against our ally will later become our greatest ally yet.
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Back with Tatsumi.
Tatsumi: I'm sorry. WHAT!
Ryuko: Clothes made humanity? What are you talking about?
Mikisugi: Life fibers are a lifeform from outer space! They arrived on ancient Earth and drastically increased the speed at which humanity evolved.
Tatsumi: That didn't help at all!
-HALLELUJAH-
Mako: Then Senketsu is an alien? He's a sailor uniform, but also an alien!
Senketsu: So what if I am.
Ryuko jumps from her chair angrily.
Ryuko: Don't buy into this crap! What the hell is this mumbo jumbo!?
Mikisugi: Would you mind sitting down quietly? I'm going to explain everything in due time. *He points to his screen* Life fibers are a lifeform that came from outer space. They invest a world's life form as parasites and breed by devouring the electrical current in a creature's immune system. However, if they infect the host directly, within its body, the nervous system would be unable to withstand the strain and burn out.