Demon Slayer becomes stronger by swinging his sword

Story of: Demon Slayer becomes stronger by swinging his sword

No heroine + comprehensive comics + passion + system + time travel to the world of Demon Slayer, and accidentally bound to a system that requires drawing a sword 1 million times to become stronger... "Number of sword swings + 1" "Number of sword swings +1"... Many years later, a blood-red Nichirin sword was placed on Muzan's neck. "Brother Muzan, the sun is so beautiful today. Do you want to go and bask in the sun together?" [Demon Slayer + Ghoul]