Takuya and Yumika are a married couple living an upper-class life, but their sex life is a bit stale. But when the husband finds out that his wife has feelings for another man, an unexpected flame of lust begins to burn within him... With the guidance of "procurer" Sakurai, this twisted love affair begins, with Takuya peeking at Yumika having sex with another man, but soon it takes an unexpected turn, and the couple find themselves falling into a whirlpool of endless carnal desire...