"Let's get married, Keiichi." Stepfather Keiichi and his twins, Ren and Takumi, are father and son, and lovers. They were discussing marriage when their sons entered the workforce, but suddenly Keiichi was asked to transfer to the Osaka branch. When Keiichi headed to Osaka, a man who knew about his past appeared before him...!? A sweet and passionate love triangle between the sex-filled working adult twins and their stepfather