Humanoid Monster Bem - S01

The series follows three youkai, Bem, Bera and Barro, who come to a large coastal city and find an evil atmosphere there, created by the immoral behavior of humans and the mischief of monsters and youkai. They decide to stay in the city and fight other monsters and youkai that attack humans, making a few friends along the way. Even though the three youkai are often mistreated by humans because of their appearance, they keep trying to protect the city's people from other monsters, hoping that one day their good deeds will let them become human.