 If you liked
Zetman
|
 ...then you might like
Birdmen
|
Transformations into an inhuman form, taking out monsters in secret.
They want to protect nearby humans. The story starts light-hearted but becomes more dark the longer the story goes on.
If you enjoy one then you should also enjoy the other one.
<>Zetman is a struggle on one's own, the characters in Birdmen are never alone.