Hitomi lives with her daughter and her husband in an apartment. Her husband is a lukewarm man, and she is always frustrated with him. One night, a man, who is interested in Hitomi's fascinating body, sees her masturbating and ask her to perform fellatio on him. The next day, he makes her have sex with him, and she wakes up as a woman. The next day, she is asked to have sex with him, and she begins to enjoy the richness of sex with him.