Ryuji has loved his beautiful and intelligent Aunt Izumi since he was a child, and has always admired her. Today, he and his family are going to stay the night at his aunt's house. Ryuji is excited to the max. A few years ago, a friend invited him to a brothel, but he refused. But for some reason, the face of his aunt suddenly came to his mind. Ryuji is still a virgin, but he somehow hopes that his first sexual experience will be with his admired Aunt Izumi.