Ken Kaneki is a university student and he is in love with Rize Kamishiro. But she was a ghoul and Kaneki didn’t know about it. One day, he was attacked by her when they had a date. She attacked him many times to prey on him. But suddenly a steel frame was falling on Rize’s overhead and she died. Kaneki could survive but he had a serious condition. Therefore he had an operation. In the operation, he had an organ donation from Rize without permission. Kaneki became a half-ghoul. Since then, Kaneki has lived an anguished life.