Red is an ex-adventurer who was once the driving force in managing his party. He took care of all the busywork, such as dealing with guild requests and supplies for their adventures. Eventually, the hero declared that he was useless in battle and forcefully expelled him from the party. Having everything taken away from him, he spent his time frequenting a guild's tavern. Eventually, a young adventurer who was in trouble was saved by Red, and she begged him to take her on as an apprentice. As time went on, he realized that he had potential in training adventurers. He decided that his true calling was to be a teacher! This is a story about a jack of all trades instructor and his versatile students that will eventually become legendary adventurers who will take down the Demon King.

The magical nation of Ingressa came to dominate neighboring countries with the power of groundbreaking military magic. Supporting this dominance from behind the scenes was Hert Eisenheim, who rose to the rank of archmage at a young age. However, due to a scheme by the court magician who was jealous of his talent, Hert was executed as a war criminal – but when he woke up, he found himself summoned before a young girl. The girl's name was Iris Refrain, and she was the first princess of the elven kingdom that he had destroyed.