Eimi hasn't had sex for years after getting married. - I thought this was normal and was living a peaceful life, but every now and then I would hear the gasps from next door and I would feel an indescribable frustration. - One day, when I went to his room to receive a gift from his neighbor, Hiyama... - Hiyama, who had been aware of Eimi's hidden masochistic nature, pushes her down as soon as he enters the room. - Eimi is forcibly raped and made to remember new pleasures, and every time she hears the moans from next door, her crotch tingles, and before she knows it, she goes to him herself...