Yuusha Party no Nimotsumochi

Within the hero's party is the world's strongest porter—and together, they've finally defeated the demon lord. Now that the party's penultimate goal has been met, the porter, Liddie, decides to follow his dream of becoming an adventurer! While his battle-related skills are close to none, he's blissfully unaware of just how strong he actually is!

(Source: Square Enix)