Kyoko Nagumo

Private detective Takayasu Higishino rescues Ayane from two men who cornered her in an alley. Ayane is startled by Takayasu's appearance, he looks just like her presumedly dead brother Shingo. Shingo's car accident occured under strange circumstances, and Ayane has hired Takayasu to help her find out what really happened. Takayasu suspects Ayane's family maybe involved, so he heads back with Ayane to her family mansion, posing as Shingo, hoping to uncover the truth.

Two sisters live with their family. The elder is reserved; the younger lively. Yet, the former is first engaged and all goes well until the young man disappears

The four principals in a love affair collide when jealousy, blackmail and suicide enter the picture.