Kotaro Kamado was originally an ordinary boy on earth, but he accidentally traveled to the world of Demon Slayer and became Tanjiro's younger brother. A sudden disaster killed everyone in the family except for the sister Yadouzi who turned into a ghost and the surviving brother Tanjiro. Like Tanjiro, Kotaro has mastered Kagura, the God of Fire, and is also born with markings and the ability to see through the world. With the help of the system, he learned all the breathing techniques as a child. During a ghost-slaying mission, he heroically rescued the Insect Pillar Butterfly Ninja and married her, becoming the tenth pillar of the ghost-slaying team - Daozhu. Fighting side by side with his brother Tanjiro, they finally killed the ghost king Muzan Muzan and protected the peace of mankind. Ghosts are creatures that only appear at night and turn into ashes when exposed to the sun.
(The plot has been greatly changed, so I don't like to accidentally enter it)
Single female protagonist
