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You can stream Buso Renkin (2006) on Hulu with a subscription.

The story begins when high school student Kazuki Muto is killed one night saving a mysterious girl from a monster, only to wake up in his school dorm, believing it to have been a dream; however, he soon finds out that dream wasn't a dream at all when a giant serpentine monster attacks him and his sister. Tokiko Tsumura, the girl he saved, explains that the monster is a homunculus. Kazuki had been attacked and killed by it when he was rescuing her; however, she, feeling responsible for him, revived him by placing a Kakugane medallion in his chest, serving as a replacement heart.

A frantic sense of disorientation fuels this kinetic journey through a world where lethal, mechanical weapons define survival. You will feel the sudden shift from mundane school life to a surreal nightmare as massive monsters hunt the protagonists through a landscape of science and sorcery.