CATS!!! (One Piece x Reader x One Punch Man Crossover)

Mio Han is an SS Class Hero and Saitama's best friend. She came back from tour as a Kpop Idol, Actress, and Model and moved back to Japan City Z to help other as a hero but also make new songs for her music. She lives next door to Saitama however the wall of the balcony broke including the inside as well so they made a the two apartment connect to each other to make a condo like apartment. One day she accidently trip on some box that is full of cats. What if these cats are not just ordinary cats. What will happen if these cats fall in love with Mio? Will they return to their original world, stay here with Mio, or take Mio with them?
(I don't own One Piece or One Punch Man or the Images)