Hourou Yuusha wa Kinka to Odoru

Hourou Yuusha wa Kinka to Odoru (放浪勇者は金貨と踊る) is a light novel series by Yukiya Murasaki with illustrations by Choko Fuji.

Plot
After the hero defeated the demon king, the world became peaceful—but it hadn't ended.

After humanity's 'enemy' disappeared, from the era of 'violence' came the era of 'money.' At the nook of trade city Faltram, the wandering hero who had hidden his identity came across the demi-human Yunis, and the female knight, Rachel with whom she was discussing with. Without much of a choice, the hero decided to help them out.

For the hero who defeated the demon lord, his new enemy are those humans obsessed with money! And furthermore, he challenges the swindlers who overrun the town...!?