Jin Kanzaki is the protagonist of the anime series Zetman. He is a young man with the ability to transform into a powerful being known as ZET. Raised by his grandfather, Jin possesses a strong sense of justice and is determined to protect humanity from monstrous creatures known as Players. Throughout the series, Jin struggles with his dual nature and the responsibilities that come with his powers, often finding himself at odds with those who seek to control or eradicate the Players. His journey is one of self-discovery and heroism.