"Furin."

Aiko has never had many crushes in her life, but when she does crush, she crushes hard - like for Haruka, the woman who once stole spouse Reina's heart for a night. Unable to explain her desires for the tomboy, Aiko nevertheless embraces the moment when she is paired with Haruka at a key party event. But how will she convince the young woman that there is nothing "furin," or adulterous, about their union? All of Aiko's years of life in the swinging world is about change the lives of one couple forever!