1 - 20 of 54 Works in Good Sibling Saiki Kusuke
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Trancendense by Nerd_Is_Here
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
08 Dec 2025
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Summary
Kuusuke still remembers that day. That stupid, stupid day.
He still wishes he could've done something. As a genius, a son, and most importantly a big brother, maybe he could've saved him. Maybe he could've been a better person to his brother.
But now, as the fog in his twisted mind starts to clear, it's already too late.
Saiki Kusuo is dead.
OR: An AU where Kusuo never went to PK Academy.
PLEASE give me criticism, PLEASE.
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ON HIATUS
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A Disastrous Experiment by KaylaGray
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
21 Sep 2025
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Summary
Saiki wakes up with a problem he's never dealt with before. Morning wood. His decision on what to do about it leads to several mortifying interactions he would much rather pretend never happened, and the fallout uncovers burdens he's tried to keep hidden from everyone - including himself.
Like I mentioned in the tags I'm not completely sure how graphic something needs to be to earn the "graphic depictions of violence" warning (I'm very new to AO3) but towards the end of the story I did write a couple somewhat violent scenes. While I don't think I wrote anything that you couldn't find in a shonen anime, I did show a bit more mature content than the Saiki K. anime ever does and at times I used much more candid language to discuss things. See the notes before each chapter for more specific warnings wherever they apply.
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Puppy-Cat Love by seraphi_m
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
11 Aug 2025
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Summary
You pretend to be a stray cat to try and get away from your sucky life, but then opportunity strikes with the boy you like.
Let’s see if you can keep this double life up and snag the boy of your dreams.
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Remember by Pietro_okahali
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
09 Aug 2025
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Summary
'Cause sometimes, memories can bring someone soul back.
Series
- Part 1 of Saiki Kusuo no Psi Man - one-shots
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Where Misfits Fit (Together) by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K., One Piece (Anime & Manga)
29 Jul 2025
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Summary
“Weren't those three little demon-spawns bad enough?” Top-hat-monocle-stashe sniffed, the state of whose teeth reminded Kusuo of the pack of bubble-mint gum stored in Mama’s purse.
His friend Snobby-Butt-Chin only sighed as he replied,
“By the Celestial Dragons, it would be in the royalty’s best interest to accelerate the date of the fire”
Okay, Kusuo feels like he’s missing some context here...
“Certainly, cleansing the filth of this country before more mutant trash rise up from the dump is long overdue... by the crown…. floating babies and robot wielding toddlers now..? That stretchy brat was strange enough…”
See, Kusuo’s not an eavesdropping bad boy! He can’t help that he’s got telepathy and that these old guys are gloating so freely after a tiny telepathic nudge!
And that’s so rude of them, him floating isn’t as weird as that dudes stache! Maybe Kusuo should help his appearance with that using his powers…
(Wherein baby Kusuo and Kusuke from Saiki K accidentally travel to the One Piece verse during the ASL flashback and chaos ensues...finally, my babies don't feel so alone in being so superhuman 🥲)
Series
- Part 6 of Baby Kusuo’s journey through infanPSI
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Second born miracle by Anonymous
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
17 Jul 2025
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Summary
“You knew I would fail, from the very beginning. You knew I would regain my powers.”
Kusuke finally turned around only to observe Kusuo’s perplexed face better. He couldn’t help the smile that pried and the laugh which teased his lips.
– I did not expect you to fail, because you didn’t. Rest assured, it was not some evil masterplan to make you taste normality without actually granting you it - though, it’s very smart isn’t it ?
OR : Post-meteor fic where Kusuo confronts his brother about his powers coming back.
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The Disastrous Life of the Saiki Brothers by Iknow_enzo
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
20 Jun 2025
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Summary
Just TDLOSK, but with Kusuke!
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Not made for Headlines (Someone you forgot to expect) by Sapphoix
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
16 Jun 2025
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Summary
What if there was a universe? A universe where a third Saiki exists? Wait-She's average? Boring.
Meet the lovely Kyouka Saiki: no psychic powers, no genius IQ, just a painfully normal girl stuck between two extraordinary brothers. -
Danger by Burralvunti for Hyshl4v4in_Sheao
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
28 Apr 2025
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Summary
On your wrist is a meter of how dangerous your soulmate is which is shown by color and is relative to your own strength. So if you’re strong and your soulmate is weaker compared to you it would show that they aren’t dangerous. Pale green is the least dangerous and dark red is the most dangerous. Underneath the meter is a phrase saying how dangerous your soulmate is. Saiki’s says that his soulmate isn’t a threat. Saiko’s says that his is catastrophically dangerous.
(Updated: 4/28/25)
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The Creation of Limiters by Suikorin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
20 Apr 2025
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Summary
What if The first other psychic that Kusuo met was not Toritsuka, but his brother Kuusuke? A story of the family dynamics within the Saiki family, centered around Kuusuke's view point and how Kusuo became the normal-craving teenager we came to know him.
A prequel to Secrets if so desired.
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contemplation by DarkCooki3
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
18 Apr 2025
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Summary
In the contemplation stage, individuals have recognised their issues but remain ambivalent about actually changing. This stage is characterised by rampant internal conflict and difficulty committing to fix their problem, despite having realised that it exists.
Saiki Kusuke opens his eyes.
Series
- Part 1 of Saiki Kusuke's Redemption Series
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(not so) secret mission by haikyuu_viera347
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
03 Mar 2025
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Summary
“That’s nice” She said awkwardly, “Erm, well you two can sit next to Saiki at the back,”
‘Saiki?’
‘Saiki?’
Both of their heads raised to look at him.
Maybe he did have something to do with their mission.
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First time by orphan_account
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
23 Nov 2024
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Summary
Saiki starts experiencing strange reactions-his chest tightens, his stomach warms, and objects catch fire-whenever he's around Teruhashi. Confused, he asks Kusuke for advice, only to be told, "You're just horny." Frustrated, Saiki dismisses him but can't shake the feeling.
Later, after another overwhelming moment thinking about Teruhashi, Saiki decides to try pleasing himself, despite having no idea what he's doing.
Series
- Part 3 of Terusai my love
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I'm Unsure Whose Values I am Living by by 3yeronically_AWriter
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
10 Nov 2024
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Summary
Saiki Kusuo, also known as Saiki Kuriko, is genderfluid.
She didn't really PLAN to tell her brother, but here we are.
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The Will of Fire by xxxTheMachinexxx
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
31 Oct 2024
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Summary
On one random day in June, Kusuke goes missing which leads to Kusuo investigating his disappearance after being left behind a strange letter.
What happens when he decides to work with the detective agency to get his brother back?
Takes place in BSD season 1 and after the entirety of Saiki K.
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A new beginning by Samuugrr
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
08 Sep 2024
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Summary
Saiki Kusuo saves Japan from the meteorite and resumes his life again with his psychic powers, the difference is that now he realized that he can control them.
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The Baby (Brother) by ItsJustPlainMilk
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
24 Aug 2024
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Summary
He doesn’t know why he protected it. Maybe it was because he knew how important it was to his parents. He didn’t want to make them sad if he harmed it even just by accident. It was far more important to them than he was, so that must be why. There is no way that it was because he was getting attached to it.
A fic about Kuusuke not being quite sure of this “big brother” thing he has going on.
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Человек за маской by Blue_moon_night
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
16 Aug 2024
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Summary
Сайки Куске может позволить себе переживать и сомневаться, но только тогда, когда никто не услышит и не увидит.
Преканон, т. е. Куске ещё на пути к своей канонной личности.
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Kusuo meets Kuusuke's "friends" by I_Dance_2_Silence
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
05 Aug 2024
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Summary
Kusuo breaks his limiters and visits Kuusuke, surprised to find that not only does he have company, but he has boyfriends? After accidentally revealing his powers to total strangers, he bonds with his brother. He later finds that his mom is homophobic (which is incredibly surprising) and decides to run away because it just isn't worth it to live at home anymore. Oh, and he starts dating Aiura. A glimpse of Kuusuke's new life in England, and the beginning's of a new life for Kusuo.
Series
- Part 2 of Psychics United
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My Little Brother Against The World by cinnatime
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
17 Jul 2024
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Summary
Kusuke rambles just a tad bit about Kusuo, except he's mentally normal about Kusuo.