Toshiro Hitsugaya is a 15 year old high school boy. He is the cousin of the Kurosakis and Hiro Ichimaru. Toshiro and his twin brother, Hoshiro, are both transferred from Junrinan High School to Karakura High school when they moved homes. Toshiro and Hoshiro goes to their first day of Karakura High School, and Toshiro sees that his finger is connected by a red string. Not understanding what is means he asks, Hoshiro but Hoshiro just laughs and decided not to tell him. How will Toshiro feel once he understands that the red string is the string of fate, his mate?