Snow-White and Rose-Red

Can you imagine having a bear for a friend? Well the two sisters Snow-White and Rose-Red can. They were so pure-hearted that they could not imagine someone or something hurting them. They lived happily in the woods and spent their time playing carefreely. But do you know what they saw once? They witnessed how their friend, the bear killed a dwarf. What happened next? Is the bear as honest as they thought or there is some magic spell which they did not know anything of?