Multiverse Crossover? A Fusion of Worlds

I was pulled into another world and transmigrated into my counterpart from a parallel world. At the same time, fantastical items and characters from countless other worlds began merging into this one. But no one else seemed to recognize these famous treasures... How interesting. So, with the System and me mutually benefiting from one another, a leisurely life of showing off in public and sharing fun facts online isn't so bad... Huh? Is District Eleven about to hold a Kengan match?