oso-san
4 stories
Beaten and Broken - Osomatsu-san by thiefofcandy
thiefofcandy
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    Parts 6
*contains harsh language, graphic violence, and abuse* An AU where Tougou wasn't stopped when he tried to kidnap Osomatsu as a child and raises him to become his partner in crime. Based off of the chapter in Osomatsu-kun titled The Terrifying Lodger. I'd suggest reading that first so you know what's going on in this story. http://m.imgur.com/a/xIw89 Here's the link to the chapter if you haven't read it. (Yeah I changed the cover because I didn't want someone else's art to have to be associated with my creation.)
The Disappearance of Osomatsu-san by aorin-starfaith
aorin-starfaith
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    Parts 168
It would have been normal if Choromatsu's alarm clock, which was set to ring every five minutes, didn't blast his eardrums so early in the morning and awoke him from his slumber. And all it took for Osomatsu to realize something was definitely wrong was to simply glance at the alarm clock Choromatsu brought with his own saved money for all the brothers to make use of it. That small, silver alarm clock that had been decorated with scratch marks from Ichimatsu's cats, Jyushimatsu's and Todomatsu's colorful stickers, and Karamatsu's leftover glitter from the obnoxious articles of clothing he's worn, was all it took for Osomatsu to drop the photo album and look around the room in horror and realization. The alarm clock, that small silver piece of technology, was clean and unscratched as it was sitting next to the futon meant only for one person. End: Jan 2019
The Moody One (Osomatsu-San Fanfic) by wholelottaslime
wholelottaslime
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    Parts 16
Ichimatsu Matsuno has been hiding many secrets from his brothers. Of course, as all secrets do, they eventually come out. See how it affects all of the sextuplets in the Matsuno family. (I'm really bad at descriptions haha sorry. There's not alot of Osomatsu-San fanfiction on here that's not the sextuplets x reader so I decided to write this! Hope you guys like it.)
My 5 Split Brothers by starlium
starlium
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    Parts 8
The Matsuno household, home of six neets and their parents. In reality, Matsuno Osomatsu, the only child of the Matsuno household, been diagnosised since childhood with Split Personality Disorder. The rest don't exist, only him.