My father remarried a beautiful woman who was almost the same age as me. My father was busy with work and was often away from home, so I (Yui Kawagoe) and my young stepmother Kanna(Kanna Shinozaki) spent more and more time together... One day, Yui saw her stepmother masturbating and gradually began to feel emotions towards Kanna that she had never felt before... Kanna Shinozaki awaited lesbian debut!