Shiho grew up being compared to her wonderful twin sister, Miho, by her parents. One day, she loves her sister's fiancé, Fuuma. Shiho continued to hide her unforgivable thoughts, but suddenly her sister died in an accident and Shiho instead got engaged to Fuuma. "I'm just a replacement for my sister" - contrary to Shiho's wishes, Fuuma gently embraced Shiho like a true lover? A long-awaited manga with a wonderful and painful love story! 両親から優秀な双子の姉と比べられて育った志穂。ある日彼女は、姉の政略結婚の相手・楓馬に一目惚れしてしまう。許されない想いを隠し続けてきた志穂だったが、突然、姉が事故死し代わりに楓馬と婚約することに……。自分は姉の身代わりに過ぎない――…そんな志穂の想いとは裏腹に、楓馬は本当の恋人のように優しく淫らに志穂を抱いて――？