Black Heart Turned Golden

This story takes place when Team Urameshi goes to rescue Yukina. They find Yukina, but there's another one??
Kira Yakima is Yukina's childhood friend. Hiei had met her on the occasion when he would watch his sister secretly. She found out his true identity and they separated 2 years after.
Now as they are reunited, Kuwabara falls for Yukina, but meanwhile, Hiei's heart yearns for the other.
What will become of Hiei and Kira? Read on to find out!