A brother who really wants to go out with his sister, Miiro.She is a younger sister who hates her older brother who always secretly takes pictures and confesses.One day, Miiro, who broke up with her boyfriend, accepted her brother's confession, saying, "If it's only for a month...".Without knowing that it was the beginning of a forbidden relationship that can not be reversed.An incestuous life that she can't tell her parents that started from that day.Miiro gradually becomes captivated by her brother and cannot live without her brother.After a while, her older brother who left her house suddenly came back with her fiancée... At that time, Miiro...