A son named Hirokatsu, who resembles his mother but excels academically, brings pride to her heart. However, this joy is shattered by a letter revealing that he was mistakenly switched at birth. As she struggles with these new feelings towards him, both as a woman and as a man, Hirokatsu confesses that he has been aware of her as a woman since learning about the truth. In the rain, they embrace their desires and passionately make love... *The recording contents may vary depending on the distribution method.