Kinka 1-Mai De Kawaru Boukensha Seikatsu

Istolfa – permanently poor, his primary struggles are finding food and a place to sleep at night. One day, while picking weeds in order to try and make money, he comes across a gold-ranked adventurer. The adventurer, surprised at his fortitude, gives him words of encouragement and a single gold coin. With this single coin, Istolfa’s life would permanently change. (Source: MangaDex, edited)