Casshan (1973)

S1E7 An Oath to the Hero Kikero

In a land threatened by relentless robot forces, Kyashan is humanity's only hope—yet the people he's sworn to protect refuse to trust him. Haunted by his own mechanical origins, he fights alone against suspicion and fear, struggling to prove his loyalty with every battle. As the machines close in, Kyashan must decide whether saving those who hate him is worth the cost.