Kuroko Tetsuya is a novelist whose pen name is Toraoku Tetsuya. He was found to have terminal bone cancer when he was 25 years old.
Just when he thought he was certain to die, he opened his eyes and found that he was in the body of a frail prince who died just after birth.
Due to his poor health, Heizi eavesdropped on the academy's classes for half a year and fell in love with that--the modest, red-haired child. Once his heart moved, he moved.
Ten years.