I traveled through time and was surprised at first that my younger siblings all had the same face.
But later, I became calm after being bound to the manga system. It turned out that this was a manga world called "Demon Slayer: Kimetsu no Yaiba". With the help of the system, I successfully changed my fate of becoming a ghost. However, due to some strange combination of circumstances, my brother Tanjiro, who was supposed to be the protagonist, turned into a ghost.
So I decided to walk down his path, pick up the heavy box containing him, and embark on the road to transform him back into a human.
Concept: Boys who exchange fate