After Keyaru was treated like a tool for many years, he promised himself to take revenge on the heroes that treated him so badly, go back in time, and start his revenge. But the world Keyaru traveled to is a different world where all the heroes were good people. On top of that, Keyaru lost his memories from the other world and his desire to take revenge, with a new life in front of him he decided to open a coffee shop with his childhood friend, Anna, without being recruited as a hero because the humans reconciled with the demons. In a new world in peace, many guest go to the coffee shop to eat Keyaru's delicious food. (Source: Kadokawa, translated)