If the Wind Pillar is immortal, Sanya Kawa has a twin brother. Although he was lost since childhood (in fact, he fell into a different world), he reunited when Saniya was on a mission. Mori, a sunny and cheerful boy, Sanya joined the Demon Slayer Corps despite being shameless, and started a series of operations.
PS: There is a ghost destroyer, Wenye, Ming Ke, the main ghost destroyer
Purpose: Demon extermination, Wenye, named Ke,