野獣は黄昏の森で愛に出逢う•Yajuu wa Tasogare no Mori de Ai ni Deau

Sisters

Mitsuko is a third year at an art high school. In the hallway, she found a painting which had won the school competition and would be hung up for a whole year; a nude painting of herself done by her little sister, even though Mitsuko had never posed for her. About sibling who draw naked drawing of each other.