After obtaining the mana/mana DNA of all twelve Celestial Sovereigns, Soukeio found himself in an unusual situation. For the past five hundred years, he had somehow got himself confined to the most secure SSS-Ranked dungeon in the world after trying to follow through on a promise he made to the last Celestial Sovereign he interacted with. However, even if he hadn't trapped himself, Soukeio wouldn't have left the dungeon until a certain someone's daughter was born. Now, in the present day, Soukeio must traverse a chain of trials even more nerve-racking than fighting the Sovereigns, trading a daughter as a single father.