Maou wo Toubatsu Shita Gouwan Yuusha, Shounin ni Tenshokusu

Also known as: 魔王を討伐した豪腕勇者、商人に転職す

by Yuma Hiiragi, Matsuri Hyouno

After sealing the demon king into an item box, the hero falls into a deep sleep for 10 years. After waking up he found the world a very peaceful place, and in order to make a living in this peaceful world he starts a business selling the convenient item boxes he has accumulated throughout his adventures in the past.