Tokyo Ghoul

University student Ken Kaneki becomes injured by Rize, a human-eating ghoul. Ken is saved when a steel frame falls on the ghoul. They are both sent to the hospital, where Ken receives an organ transplant from Rize. Because of that, he becomes a half-ghoul.
(Source: AsianWiki)
~~ Adapted from the manga series "Tokyo Ghoul" (東京喰種トーキョーグール) by Ishida Sui (石田スイ).