After transmigrating, San Chuanlin gained the Stand [Bohemian Rhapsody], with the ability to connect to the worlds of works of fiction. She soon realized things were more complicated than they seemed.
Kibutsuji Muzan got DIO's script, JOJO put on the Stone Mask thanks to DIO's meticulous planning, Rin Tohsaka from the Fourth Holy Grail War came back from ten years in the future, and the Homunculus in the Flask became Truth.
Kamado Nezuko: "Demons have limits. I'm done being a demon!"
JOJO: "What do I do now that I've become a vampire? Waiting for an answer online, urgent."
Rin Tohsaka: "@San Chuanlin, help me out. I need to borrow your power to save Sakura. I'll repay you ten years from now. Huh, now? I'm still just a kid!"
As her connections to these worlds grew, her Stand ability developed.
Then San Chuanlin discovered that her own world was becoming abnormal too. "It's one thing for this world to be abnormal, but why is there a Stone Mask here?"