After attending her husband's funeral, Itsuki Azuma shares drinks with family and relatives to mourn his passing. Dressed in a black mourning gown, tears glistening in her eyes, she hides a secret unknown to all. Before his death, her late husband had secretly been involved with his younger brother, Natsuya, while she herself had developed a relationship with her stepson, Kôichi, that went far beyond the normal mother-son bond. Now, the beautiful, grieving widow finds herself caught in a whirlpool of desire between these two men. What fate awaits her?