I Cosplayed as a Little Pearl and Picked Up Chuuya

The story is undergoing a major rewrite after going on hiatus. The revised chapters no longer match the original plot, so you can treat this as a new book.

This is a story about a little siren and Arahabaki meeting.

The protagonist, a cosplayer dressed as a little pearl, accidentally transmigrates into Bungo Stray Dogs and wanders into the explosion at the center of the Bowl Street incident. Along with Chuuya Nakahara, the newly born Arahabaki, they're blasted into the world of The Mermaid's Fall, where they stumble onto an IOA mission in progress.

Aiai had thought she'd escaped Yokohama, the city her best friend described as a place where explosions were an everyday occurrence and mafia members were everywhere. She never imagined she'd end up back there after all, teaming up with her childhood friend Chuuya, who's headed to Tokyo's Jujutsu High, to save the world...

The world-saving high schoolers (not really) are back in action!