By chance, he traveled through time and became Genji's treasure, Mustache, and lived his daily life in the manga world.
Mustache: I thought I just reincarnated into a sword and became a knife master. I also said that I would witness the history of Genji, but I didn't expect that I actually came to a game world (●—●) Oh... Wait... This seems to be a fusion of many small worlds⊙▽⊙? ? ? Well, it's not a big deal. Long live Genji.