1 - 20 of 29 Works in Autistic Tokitou Muichirou
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When Waterfalls Fall -Dad Giyuu- by KomeiTheHoshiko
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
08 Feb 2026
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Summary
He didn’t remember when he had gotten close to the kids, it just happened. Suddenly, he was “Giyuu-san” (or the derogatory use of “Dad” or "Mom" used by Inosuke when he says anything parental-like) to a group of teenagers.
He glanced to his left, where Muichiro was staring off into space, walking beside him. He had spent the night at the water estate again, after showing up, dazed and confused, in the rain. Not that Giyuu minded, he had a few Yukatas and such saved, as well as ready room for him, or the other kids, in his home that he had bought after realizing that having Tanjiro meant attracting whoever else was with Tanjiro. He also wondered how Tanjiro had so many friends, and managed to attract them like flies. But he did enjoy having the kids over, they were a lot to deal with, all in all, but they were sort of nice, they made his Estate livelier and just… better.
OR: Giyuu Tomioka slowly finds himself becoming a parent for the kids around him, and they slowly accumulate at his lovely estate hidden behind the waterfall, because I live for found family and them.
(Originally named "Family in the Waterfall", I changed it)
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Sullen Tides by GayForGiyuu
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
12 Jan 2026
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Summary
Giyuu was tired.
In the span of a few hours, he had been sent on an assignment with Shinobu, killed a lower moon, encountered a pair of siblings he never thought he’d see again, fiercely protected them with his life (literally), and worst of all:
He’d had to socialize. -
Kites by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime)
10 Jan 2026
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
As Muichiro's mental and physical health deteriorate, Sanemi searches for solutions. A budding friendship between Giyu and Nakime leads to a huge boost for Sanemi's mission.
Series
- Part 21 of Slayer X Family
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Planes by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
14 Nov 2025
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Muichiro's school goes on a graduation trip to Hugaria. Sanemi and Giyu go along as parent chaperones. Muichiro runs into someone he hasn't seen in a long time, but could never forget.
Series
- Part 20 of Slayer X Family
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The Meow Hashira Meeting by nezusupreme
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
09 Nov 2025
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Summary
Eight Pillars. One box of cats. Absolute mayhem. Who knew kittens could be so dangerous?
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Slayer X Family: Author's Art by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
13 Oct 2025
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Summary
A compilation of artworks made for my series Slayer X Family. Mostly panels from Spy X Family redrawn as Slayer X Family. Enjoy!
Slayer X Family: A series exploring an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Series
- Part 18 of Slayer X Family
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Cats by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
06 Oct 2025
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Summary
A twoshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Muichiro, Sanemi, and Giyu choose to adopt a pet cat for Muichiro’s mental health. Chaos follows when they find themselves in the middle of a terrorist crisis that threatens to bring back a military conflict between Westalis and Ostania.
Series
- Part 19 of Slayer X Family
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Fans by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
25 Jul 2025
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Summary
A sixshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
When an extreme heat wave hits, Sanemi, Muichiro, and Giyu escape it on a coolcation to the western mountains, with Rui and Jeeves. They climb mountains, soak in hot springs, and almost get themselves killed when Sanemi is handed a mission to complete, Giyu finds himself face to face with someone seeking vengeance, and Muichiro encounters people he hasn't seen in a very long time, but could never forget.
Series
- Part 17 of Slayer X Family
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Confessions on the dance floor by Moonboy_mio
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime)
09 Jul 2025
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Summary
It’s tengens birthday and we all know Tengen is flashy so the gang throws him a flashy party!!! Little do they know something went down in the bathroom…
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Hearts by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
07 Jun 2025
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Summary
A fourshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Love is in the air at Kimetsu Academy as the gala approaches. An event like this just might be enough to cause students' true feelings to finally surface.
Series
- Part 16 of Slayer X Family
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The Kiyomi Mountains by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
30 Apr 2025
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
(The second part so far of Slayer X Family to not be named after origami.)
Muichiro, Sanemi, and Giyu go on a three day ski trip to the Kiyomi Mountains. Their plan is simple, to have fun skiing. But it becomes much more than a ski trip...
Series
- Part 15 of Slayer X Family
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Jumping Frogs by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
23 Mar 2025
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
A normal weekend in the Shinazugawa house becomes very... not normal, with storms and flooding. Still, they make the most of it.
Series
- Part 14 of Slayer X Family
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Love between your scars by orphan_account
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
10 Mar 2025
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Summary
Obanai could never forget those eyes.
He remembers them perfectly, remembers how those blue irises merged with the colour of the sea.
Obanai could never forget her.
His first impression was her eyes, then her scars, her personality, her laugh, her voice and finally her heart.
Or, the story of how Giyuu and Obanai, torn apart by their past, learn to love and live slowly by supporting each other and healing their wounds (of course in between they will have to put up with gossiping kids, an overprotective brother, Tengen's craziness and much more !!).
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Dragons by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
01 Feb 2025
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Summary
A oneshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
The bullying from Kaigaku's group gets worse as they aim to completely ruin Muichiro's life. Then, one incident changes everything.
Series
- Part 13 of Slayer X Family
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Bookmarks by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
15 Jan 2025
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Muichiro goes to Central Library, finding Rui there. The next day, they study together.
Series
- Part 12 of Slayer X Family
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Bears by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
22 Dec 2024
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Summary
A twoshot of an SXF inspired, Muichiro-centric, alternated universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Grade 7 students at Kimetsu Academy go on a field trip to the zoo known as Wild Wonderland. It doesn't go as planned.
Series
- Part 11 of Slayer X Family
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Cranes by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
10 Dec 2024
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Summary
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
After exam week comes to a close, the students look at their scores. There will always be those who score the highest, and those who score the lowest. And sometimes, those who fall under the latter category will attempt to drag the former down.
Or, a certain bully at school targets Muichiro, with the goal of completely ruining his life.
Series
- Part 10 of Slayer X Family
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Snakes by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
09 Nov 2024
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Summary
A oneshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Muichiro gets very sick and has to miss school. When Giyu is away and Sanemi is very busy, Sanemi brings an unexpected babysitter...
Series
- Part 9 of Slayer X Family
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Autism by KosmosTheUnderworlder
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
21 Oct 2024
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Summary
Being neurodivergent, Muichiro's brain is of an alternate neurotype than the general, or, neurotypical population. This makes him different, and poses many challenges in his everyday life, trying and struggling to play by the rules of a world not built for him.
(I know I've hinted at his autism in this series multiple times now. This threeshot will be a bit more focused on it.)
(The only part so far of Slayer X Family to not be named after origami.)
A threeshot of an SXF inspired, Muichiro-centric, alternate universe where Sanemi is a spy, Giyu is an assassin, and Muichiro is their adopted telepath son.
Series
- Part 8 of Slayer X Family
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Tokito Muichirou's Guide to Getting Two (2!!!) Dads by Lovette (MyCorner_ao3)
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime)
18 Sep 2024
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Summary
Oyakata-sama sent Muichirou and Giyuu on a mission where they have to pretend to be father and son. Muichirou feels fatherly affection for the first time in forever and decides that he likes it quite a bit.
Then Giyuu pickes up on it and asks Sanemi for advice.
Then Sanemi decides that Giyuu would be a horrible father figure and tries to steal Muichirou.
Then they all become a big happy family <333OR: Reverse-adoption trope where Mui looks at Giyuu and goes "father." Then Giyuu freaks out and asks Sanemi for advice and Sanemi looks at Mui and goes "son."
(BTW: this is set before the trial of Tanjirou and Nezuko!)Series