The rider

wake up

Deku is now in the infirmary in of U.A and all might and aizawa are talking to the class

Am:Don't worry he's perfectly fine but we do have some bad news.

Izumi:w-what is it?

Aizawa:he won't wake up for another week.

Izumi begins to tear up and asks if she can see him which she is allowed

Izumi walks in and sees her brother hooked up to multiple machines and she sees his heart rate and its abnormally slow

Izumi:why did this happen? It didn't happen last time.

Then all might walks in and Izumi asks if she knows how this could've happened

Am:based on what I saw I think the power may have been to much for him to handle. Has this happened before?

Katsumi:ya it has.

The two who first walked in whil their head around to see Katsumi leaning on the doorway

Katsumi:it happened once in junior high.

Flashback boi's

Its a regular day and it shows deku and his sister with katsumi walking around in casual clothing

Katsumi:so what you guys want to do?

Deku:don't know.

Izumi:I don't know either.

Then deku sees the day suddenly turn to night

Deku:get behind me.

He activities a small amount of fire on his hand to light their way because at the moment every light goes out and it is pitch black

Deku:hold onto me.

Katsumi holds onto his right arm and Izumi wraps her arms around his chest and they walk off

Deku lights small controlled fires that keeps the people able to walk around

Then he hears a TV static but from everywhere

Deku:what the hell?

Izumi:I'm getting scared.

Katsumi:don't worry. Remember what he and I can do.

Izumi:r-right.

She then sees an absolute nightmare

Izumi:izuku what's that?!

Deku turns around and sees the creature

Deku then immediately activates the full rider form and moves infront of his sister

Rider:what are you?

?:&!>=<+_=?.

Rider:huh?

Then the creature grabs both Izumi and Katsumi but deku manages to get them out of the grasp of the creature but

Izumi's neck and katsumi's stomach have been cut open and they are spewing blood and Izumi passes out

Deku then turns around and uses his fire to burn close the wounds but then he slowly  stands up

Katsumi:w-what a-are you doing?

Deku's skull then morphs into a crown

Rider:you just fucked up!

He runs at the creature and captures it in chains but it phases through them and it grabs deku by the neck and flys him up to the stratosphere and eventually into space

?:have a fun time. Rider!

Deku begins to laugh

?:what's so funny?

Deku the lights his fist on fire and punches through the creature leaving it to burn and using it to enter the atmosphere and begins to fall

Back on the ground Izumi has woken up

Izumi:what happened?

Katsumi:deku was just dragged into the sky.

They then see the black turn to the normal blue sky

Katsumi:what the heck?

They then see something falling from the sky and fly over them and into the water near a beach

Katsumi:I'm going to see if that was deku.

Izumi:I'm coming to.

They walk over to the beach and sees a figure with devil horns walking out and also the water is boiling dragging the creature

Rider:hell.

Then he deactivates his quirk and turns into deku again

Deku then drops the creature and falls down

The two girls run to him and pick him up

Deku:weird.

Flashback end

Katsumi:he told me what happened in space.

Am:wow it took years for the first man to land on the moon but it took him a few seconds.

Izumi:do you think it's based on how long he uses that second form?

Katsumi:its a possibility.

All might then leaves to talk to detectives and give footage of the usj

Izumi then kisses her brother on the forehead

Izumi:I'll see ya tomorrow izuku. Love ya.

Katsumi and Izumi leave