Kasumi and Ryutaro met three years ago through an introduction, and after he enthusiastically proposed to her, they got married. However, since last year, Kasumi's sexual function has been impaired by a combination of aging and work stress, leading to erectile dysfunction. In order to restore his function, Ryutaro plans to have Miyata, a young electronics store employee, cuckold his wife. Seeing Kasumi having sex with him, Ryutaro's sexual function is restored and he is able to embrace Kasumi, but what are Kasumi's true feelings?