It’s a cliché that should never actually happen: an Isekai Transmigration. A middle-aged man, who was being falsely accused by a high school girl on a train, suddenly finds himself in the realm of the gods—along with Mizuki, the very girl who framed him. The Goddess Lakshell intervenes in their bickering and bestows upon them a divine decree: defeat the Demon King. Granted three 'cheat' special skills by the Goddess, the old man and Mizuki are sent to another world—a realm resembling medieval Europe where the concept of 'Levels' exists. However... they soon discover that the Demon King they were supposed to defeat was already slain 100 years ago. On top of that, with his mediocre physical abilities, the old man struggles to defeat even a lowly trash mob like a goblin. To survive in this unexpectedly harsh world, he decides to buy a slave and form a party. That is how he meets Pham, a beautiful girl of the Dog-ear tribe. Alongside Pham, the old man begins his modest life as an adventurer, steadily working through dungeon crawls and daily quests—. Is life in another world really that easy? Definitely not!