After quitting graduate school, Souta Saita started working as a chemistry teacher at his alma mater. After years of hard work as a teacher, he is suddenly diagnosed with a disease that leads to his death. When he wakes, he finds himself in another world. Souta Saita is rescued by the villagers of the drug village in the other world, and in return for their kindness, he begins to help them with their work, demonstrating his skills in producing high quality drugs. At first, Souta Saita dreams of a peaceful and gentle life in the village, but as he faces various crises that befalls the village, he rises to become the boss of the mafia, offering a helping hand to those in need, shouldering the anger of the oppressed and fighting on their behalf.