Maou-sama no Atoshimatsu
魔王様の後始末
A peace was achieved when the Demon King and a princess fell in love, ending the war between demons and humans. Together, they searched for safe places for demons to live. Sixty years later, the princess, on her deathbed, reveals her regret in allowing demons to leave their world. Grieving, the Demon King embarks on a new journey to correct past mistakes and build a world where demons and humans can truly coexist.