Her mother was a human, her father a Dragon demon, and her brother is the evil Naraku, once known as Onigumo. When her brother attacks their village their father went to do battle with his own son while her mother took her far away from the village. It was the. That Koroko was placed under a powerful sleeping spell by her mother for 50 years ago to protect her from her brother's evil.

When 50 years had came and gone the sacred Shikon Jewel has been broken. A jewel shard lands near Koroko and awakens her from her long sleep she tries to make her way back home with the help of Inuyasha, Kagome, Miroku, Sango and Shippo. With their help, Koroko makes her way home and stop her brother's evil plans but she also wants to find a way to bring Onigumo back to the way she use to know him and not what he is now. Bonds will be tested as well as friendships. Can the group look pass the fact the Koroko is their greatest enemies sister or will her blood ties with Naraku keep the group from totally trusting her? 

Disclaimer: I do not own InuYasha