Ai was just a normal 17 year old girl. she almost had the perfect life. AI had great friends. wonderful caring parents, and most importantely a great twin sister misa. That she was ver close to. Her and her twin was alike people had trouble telling them apart. But ine day when ai went to get misa from her boyfriend house. She discorved Misa laying in a pool of her own blood dead. She had been murdered but by who. So after the furneal ai sinked into depression. She aslo made a personal vow to find and kill the monster who killed her beloves twin sister.