Maou Gakuin no Futekigousha: Shijou Saikyou no Maou no Shiso, Tensei shite Shison-tachi no Gakkou e  Play Trailer

魔王学院の不適合者 ～史上最強の魔王の始祖、転生して子孫たちの学校へ通う～, The Misfit of Demon King Academy, The Misfit of Demon King Academy: History's Strongest Demon King Reincarnates and Goes to School with His Descendants, Maou Gakuin no Futekigousha, 魔王学院の不適合者, ใครว่าข้าไม่เหมาะเป็นจอมมาร: ต้นตระกูลจอมมารที่เเกร่งที่สุดในประวัติศาสตร์เกิดใหม่ไปเรียนที่โรงเรียนลูกหลาน, 魔王学院的不适任者～史上最强的魔王始祖，转生就读子孙们的学校～

In 2000 years, the demon lord Arnos has been reborn. However, despite his immense power to destroy humans, elementals, and gods, he finds himself struggling at an academy meant to cultivate future demon lords due to his "ineptitude." After centuries of warfare and conflict, Arnos yearns for a peaceful world and decides to reincarnate in the future. Unfortunately, upon his return, he discovers that the world has become accustomed to tranquility, resulting in his descendants' diminished magical abilities due to a significant decline in power.