Forced to Cosplay Dazai, I Decide to Torment Everyone

So, I was just an unremarkable fanfic writer who'd recently gotten into Dazai and tried a low-key cosplay of the Armed Detective Agency Dazai with a sandy-colored trench coat.

Then I got the bright idea to wrap a red scarf around my neck and transmigrated to Yokohama in the IF universe.

(Gasps sharply)

The Demon in the IF universe saw the red scarf I hadn't taken off and mistook me for the disguised Boss Dazai, then chased me all over the place.

I'm not Boss Dazai or Armed Detective Agency Dazai! You've got the wrong person! Aaaaaah!

Damn it! Where are you, real Boss Dazai? Get out here! The Demon has come to Yokohama, and your script is about to go up in smoke! (Screaming at the top of my lungs)

Oh, Boss Dazai has already completed his five-step plan to jump off a building. (Eating angst through my tears)

What was that? The Demon in the IF universe is a player from another world, a fourth-dimensional calamity who transmigrated from the real world? (Confused)

The two transmigrated fanfic girls hit it off immediately. Player Fyodor (Fake) provides the "Book," while fanfic-writer Dazai (Fake) provides the words. Together, they resolve to bring Boss Dazai back to life.

As for all the parallel worlds they'll wreak havoc on along the way

The fanfic girls: Yay! New material to write about!

P.S.:

1. This should have two protagonists, I think. The main POV is the fanfic girl (Fake Dazai), followed by the player (Fake Fyodor). There probably won't be any pairings, maybe just Dazai-centric? I'm not sure yet whether the Katekyo Hitman Reborn! universe will show up.

2. The Dazai cosplayer isn't a serious professional cosplayer, but a useless college student who occasionally writes fanfic and is a Dazai fan. Her nickname is Wanwan. The narration will generally refer to her as the fanfic girl.

3. In this story's IF universe, there's no original Fyodor, only Fake Fyodor. The Fyodor in the parallel world is the original, but he'll differ quite a bit from the canon version. The narration will generally call Fake Fyodor the player. Before the story begins, the player dies after playing a full-dive Bungo Stray Dogs game in the real world and gets trapped in the game. He's from a different real world than the fanfic girl.

4. I started writing this story because of a dream I had. In the dream, Fyodor chased me from Bungo Stray Dogs into the real world, then chased me back into Bungo Stray Dogs, making me jump into a river several times. Finally, Fyodor caught me in a shop while I was drinking apple juice, tied me to a chair in the Armed Detective Agency, and made me watch Bungo Stray Dogs. I laughed while watching, partly because tormenting Dazai seemed fun, and partly because Fyodor had grabbed the wrong person: I wasn't really Dazai. While I watched, I thought this could make a good reaction fic, and then I laughed myself awake. That's where the idea for this story came from.

5. The fanfic girl isn't any version of Dazai and won't be assimilated into Dazai either. The player had already finished assimilating before the story began, so there's no changing that.

Theme: Happiness is the meaning of life