Minikui Yuukaku no Ko

Abandoned by her latest family, Esora is left with nothing and nowhere to go. Starving, she steals food from a temple and sneaks inside to wait out a thunderstorm. When she wakes up, she's been transported to a different realm, and sold in chains to a mysterious man in a paper mask. Trapped in a strange new world, Esora must now begin training to become a Courtesan if she wants any hope of regaining her freedom and discovering the masked man's secret...

(Source: Mangamo)