A slice-of-life film, partly told through the eyes of an anglefish a 10-year-old boy called Lenno who has a behavior disorder and goes to a school for troubled kids. The anglefish is known for it’s aggressive behavior. But under the right circumstances it can grow up to be a kind animal which lives in harmony with other fish in an aquarium. While Lenno tries his best to behave and be ”a good boy”, we see how the anglefish fares in his new home.
Meanwhile Lenno learns it’s quite hard being good. And what does good or bad really mean when your brother sometimes hits you and your father has regrets about the way he has lead his life? Will Lenno find out how to behave like an angel and will the angelfish survive the care given by Lenno? Life is complex and maybe there are more shades to it than only black and white.