Savior

In the middle of an infinity of worlds, which respect the rule of non-interference, there lives a Savior in the city, who protects the people. Holding his guitar, he has a mission: save each world from its own crisis. Almost every time he succeeds, but always feels a little more gloomy. One day, a shooting star brings an illness to the city which turns people into zombies...

(note: Chinese zombies and Western zombies are quite different).