I was the weakest of the four heavenly kings. I reincarnated, so I hope for a peaceful life

I was the weakest of the four heavenly kings. I reincarnated, so I hope for a peaceful life - One of the four demon kings, Demon King Langa, was despised as being the weakest of the four heavenly kings and a demon mess because he was made up of the lowest species.One day, he was defeated by fighting alone with a brave party in the plot of the other four heavenly kings. You will lose your life.Reincarnated as a human child, he wants a peaceful life this time, but he has awealth of combat experience, an excellent but dangerous lieutenant who longs for him, and his magical power is 100,000,000."I will lead a peaceful life this time!" His wish will come true ...?