Kaiser de Emperana Beelzebub III

Driven by a chaotic desire to annihilate humanity, this forgetful Great Demon King, known as Beelzebub III, operates with a remarkably scattered mind. After initially dispatching his youngest son, Beelzebub IV, to conquer the human realm, the monarch accidentally attempts to send his eldest son, En, on the same mission. It is only through the persistent reminders of his loyal servants that he realizes his blunder, ultimately deciding to send both princes to complete the task together.