[Content warning] Contains a lot of personal headcanons. The plot is chaotic, with a particularly dark take on the mastermind. Saihara and Shirogane are both staff members and can make their own Monokumas.
The day after Saihara Shuichi was invited to appear in Shirogane Tsumugi's Danganronpa V3, his headaches got worse by the day. First, an overly familiar piano girl latched onto him, then all sorts of strange Ultimate students gathered around him.
Saihara Shuichi: I'm tired. I'm leaving.
He glanced back at Shirogane Tsumugi, who was having the time of her life.
Saihara Shuichi: Fine. You stay here and keep them company.
He somehow figured out how to open a little door through the dimensional wall of the V3 set and step outside, only to find himself in Tokyo in another world.
Was this all part of your plan too, Shirogane Tsumugi?
Unsure whether there was an audience beyond the fourth wall, he followed his character settings and opened a detective agency. He hadn't solved many cases before he somehow got mixed up with an evil organization...
Shirogane Tsumugi, if you had nothing to do with this, I'll change my name to yours!!!
Please, Saiki, after this is over, I'll treat you to a coffee pudding made by an Ultimate Pastry Chef! ---- A desperate plea from a certain Shirogane girl
[Received.]
Theme: Everyone deserves to find salvation through friendship