Demon Slayer: Obtain an Unlimited Warlock at the Beginning

He tortured Twelve Ghost Moon and Wu Pai severely. Most of the characters in this book are not OOC. The main character's purpose is just to drag Wu Pai out to bask in the sun and drink wisteria tea. The heroine is Shinobu and Lei. If you mind, please read the introduction. Note: The main character is not invincible and grows slowly. But I can do whatever you need. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.