Kinka 1-mai de Kawaru Boukensha Seikatsu

Story:

The main character is a homeless orphan boy. His life is built on the constant search for food and lodging for the night. But one day, while gathering weeds to try and earn some money, he meets a gold-ranked adventurer. The adventurer, surprised by his fortitude, encourages him and gives him a single gold coin. How does he use this chance?