Explanation for my AU! (Not an update)

Amused, Barrow smiled and conjured more magic capable of blowing up the room and both Barrow and Cale to dust as well.

"I'll be taking your young master with me."

Barrow said as he blew up both Cale and himself.

Or in which Cale and White star die and transmigrate into the demon slayer world on a mission set by their mother. (Yes a little AU here)

Trash Of Count's Family and Demon Slayer do not belong to me!