Doom breaker

Zephyr is the last human fighting evil in a world abandoned by the gods. After a five-year war against humans and demons, Zephyr is slain by Tartarus, the Demon Lord. In the aftermath, much of humankind was either slaughtered or captured as hosts for demons. When all seems lost, Zephyr is abruptly reincarnated, much to the sinister amusement of the gods, to save humanity and avenge those he loves.