I Will Take the Demon King to Conquer the World

I was fired from my job, forced to get married by my mother, and even got into a car accident while relaxing. How unlucky and sinful I must have been, to have let a bolt of lightning take its toll. What, fifteen years ago? Traveled through time? Suddenly, he returned to his school days and picked up a little snake who called himself the Demon King. Fight wits and courage with the demon slayer, find artifacts while practicing, and have fun with the entire business empire. However, my dear Demon Emperor, if you are so helpful to others, you are not... Falling in love with me!