Sodatete Miryu? ~Boku to Lilith no Chotto Fushigi na Monogatari~

In a little village somewhere and somewhen, young Abel (the protagonist) and his older sister Cecilia, a couple of orphans, live together in the little house of their long lost parents. Their life is simple but happy, and supported by Cecilia's occasional sales of (conveniently) natural products collected from the village forest and, more importantly, from Abel's job as shepherd at a nearby farm.
It's only when the game starts following Abel's daily routine that we discover that the story is set in a fantasy world, because the native sheep have a (female) humanoid form...

[From a forum post by Baldo]