1 Work by Mrs_Cheese
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Gotham’s got DEMONS by GentlemenCheeseBurg, Mrs_Cheese
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime & Manga), Batman - All Media Types
12 Jun 2026
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Summary
Gone are the days of demons and demon slayers, Muzan was killed in the final battle and the humans had prevailed. Lives were lost, but justice had been served. All of the remaining demons perished when their connection to the demon king was severed. At least... That was for everyone except two. Yushiro Yamamoto, and his demon cat, Chachamaru, the last two demons on earth. They lived long past everyone who survived the era of demons except for the oldest man in the world, Kiriya Ubuyashiki. But, he was an old man whose stories were made up by someone who had long lost his mind to old age.
Yet they were true.
After crossing paths with a woman who looked identical to his past partner, Tayamo, and the industrial boom of Japan, Yushiro packed his stuff along with Chachamaru and left for the hills. Or rather, left for Gotham, a city in the Americas, better known as “the crime capital of the world.” Now he's trying to make it by living in a city of crime. It's easy for a demon like him to slip in and stay hidden. At first it was just an unregulated and a poorly policed place, but then Batman began his reign. And soon the robins came as well.
TLDR - Yushiro is old.