Raw Blue no Hyouhon

The heart of every living being hardens and remains after the body dies. One day, the traveling merchant Faris found a girl who had collapsed in the desert and took her under his care. The girl, who introduced herself as Eva, was told by Faris about their current location, the oasis city Aurof, and he took her to the town to show her around. As they walked through the merchant city lined with villas, Eva gradually began to open up to Faris and confessed, "I ran away from that house." Thus begins the story of a girl carrying a forbidden secret.

(Source: Kodansha, translated)