A/n I like the idea of demon!Nagisa and Angel!Karma but its for the irony. I switched it around and here you go:
(We get some warning worthy iso-heara or whatever the name is in here)
At a random crossroad:
"This better work." Isogai covers the small box with gravel and looks around. He sighs in defeat. "Of course. This was stupid."
"Oi! What is the Ikeman doing at a crossroad?" Karma walks up, snapping prince charming's attention away from the ground.
"I-I-!..." There's no use in lying. Besides, what would mother say? "I was trying to cure my mother..." He whispers.
"With a demon deal?! That's risky business, prince." Karma scoffs, walking closer. "But, I might have a solution for your mother." He holds out a hand and Isogai, who stares at it in frightened amazement. "If you'll take it."
"If it can cure my mother." He extends his hand towards Karmas, only to be stopped by a familiar voice.
"Hey guys! What's happening?" Nagisa comes running towards them. Karma takes a darker tone.
"If you want the deal shake my hand now." His eyes narrow.
"Why?" Does the medicine expire soon?
"Before he gets here!" He holds his hand out further.
"Karma! I've been looking for you!" Nagisa seems to teleport from the great distance he was just at, stepping between the boys.
"Well I'm making a... an agreement. Nothing to worry about. I'll meet you at your place." Karma says in the least menacing tone he can manage.
"Will said agreement cost a soul?" Nagisa whispers, though unable to keep Isogai from hearing.
"Don't be silly, Nagi." Karma stops trying to hide it. He's pissed.
"I'm not being silly." The bluenette turns quickly. "Run Yuuma!" He grabs Karma by the collar and a pair of large white wings rip through his shirt. Isogai stairs in amazement for only a second, finding it hard to look away until a pair of bat-like wings can be seen behind the white ones. They're real! Angels and devils! They're real! "I said run!"
-/-/-
Everything's real. There's an angle and a devil inside these doors. I'm in a class with celestial beings. And how crazy is it that they always act like friends.
"Yuuma. Come 'ere." The sly voice of Karma comes from behind me.
"Oh... Karma... how's it going?"
"Don't pretend. You're afraid. I can smell it. Just don't say anything about The whole angel thing. Nagisa took a chance, saving you like that. The deals off, so don't come crawling back later. He'll help you now." He rolls his eyes with an annoyed tone before walking away. Well Karma won't do anything... I guess Nagisa won't be too mad. I ponder the subject until I get to my seat, the bluenette occupying it noticing me immediately.
"Yuuma. I wanted to talk to you about yesterday." Oh no. He looks stressed. "You can't say anything. Karma and I... we're run aways. We're warded. The only way we can be found is if a lot of people start talking about an angel and demon in the same school." The bluenette stops twirling his fingers to look at me. Runaways, huh? That's odd.
"I won't tell a soul. But... Karma said you could help me with my mother?" His worried expression goes cold and blank, his eyes seemingly becoming glass in body of stone.
"I would like to help but, she knew what she did. Deals must run in the family." He blinks back to reality once he stops talking. "I'm sorry... I wish I could help. Soullessness is beyond my power at the moment. It'll take awhile but I can restore her soon enough." He whispers quickly. Soulless? My mother sold her soul?

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Karmagisa stuff
Fanfiction[Suggestions closed] This is entirely karmagisa btw sometimes other ships are thrown in (The writing gets MUCH better as the chapters progress) Mostly oneshots Some are normal. Some are AUs. Some are angsty. ⚠️Warning ⚠️ I often refer to Nagisa's...