Demon slayer swap au. (Eli's version)

Prologue

Gyutaro was working on side hustles to supplement his income and that of his sister. So that they could eat bread. Despite the fact that it wasn't particularly delicious, it did keep their stomachs full. After he finished his work and received payment. He joyfully went to get some bread. Excited to see his darling sister's smile. When he got almost home, his smile and expression faded. He witnessed his sister tied up and nearly burned to a char because Ume stabbed the samurai in the eye because she did not want to be taken advantage of. He stared at the old woman and the samurai who had attempted to kill his sister Ume. Gyutaro's blood boiled, and he began to see red. Because of his fighting ability, he killed both the samurai and the elderly woman in a fit of rage. He then carried Ume in his arms and started looking for help in the cold winter night.