Update as the occasion arises
The Demon Lord Ancestor was playful and threw himself to death (he became smaller), so he descended to the mortal world with the boring mentality of "Oh, if I don't die, I will go to the mortal world while I am small". Then, he was kidnapped by a certain "wooden" god who learned the news.
The God of Inconsistency Attacks × The Enchanting and Coquettish Demon Lord Shou