Saiouma, also known as Oumasai, is the slash ship between Kokichi Ouma and Shuichi Saihara, two characters from the third killing game in the visual novel series, Danganronpa.
The two of them are never really friends during the events of
Danganronpa V3, but most people ship them due to their interesting and unique chemistry.
Shuichi is the Super High School Level Detective, and Kokichi is the Super High School Level Supreme Leader. Kokichi has a childish personality and lies a lot, while Shuichi is an awkward and kind character (who builds confidence throughout the game).
Kokichi does seem to show some kind of interest in Shuichi, especially in the
4th Chapter
investigation. He tells Kaito Momota (Shuichi's best friend and sidekick) that he wants to take his place and be Shuichi's sidekick instead. Kaito obviously tells him no though, but Kokichi helps Shuichi in the
investigation anyways.
During the 6th
investigation, Shuichi can explore Kokichi's bedroom and he sees that he's the only person Kokichi found trustworthy (as shown by the word "trustworthy??" written under a picture of Shuichi). That's a big thing coming from Kokichi, he didn't trust anyone in a Killing Game in case someone he bonded with was the Mastermind. That makes this another reason people ship the two, Kokichi has trust in Shuichi.
"Why do you even like Saiouma? It's a toxic ship!"
"No it's not toxic, Kokichi never did anything bad to Shuichi directly, all that happened between them was Shuichi telling Kokichi he'd always be alone after his
manipulation in Chapter 4. The
relationship isn't toxic, that's only what some of the fandom makes it out to be. They just had some arguments, which makes sense given the
circumstances of the characters being in a Killing Game. It's really just one-sided."
"That makes sense, have a poggers day my friend."