Erika Kayama is an experienced urban redevelopment lawyer, who gets things done rationally. While working around the clock at a demanding job, her period stops and her doctor attributes it to a drop in female hormones. She hears that physical intimacy is an effective cure, but she cannot expect that with her husband as their relationship is not what it used to be. Yet finding a convenient sexual partner at work or in the neighborhood can be tricky later.

One day, Erika learns about male massage therapists on the Internet. Although prostitution is illegal in Japan, there are many male-oriented adult entertainments that bring a client to orgasm without intercourse. Sexual massage for women has also become increasingly popular recently. Erika decides to take a rational approach - try the "therapy". As Erika waits at a love hotel in Shinjuku, a massage therapist named Yuji arrives. With a mixture of anticipation and anxiety, Erika's first experience of female sex work begins.

Original/Alternative Title: ナニカ…