"Boy" follows the lively and imaginative Boy (James Rolleston). Alamein is his real name, named after his dad. He has a very shy brother named Rocky (Te Aho Aho Eketone-Whitu), who believe his power has caused the death of their mother.
The story basically starts upon meeting their estranged father, Alamein (Taika Waititi), after being in-prison for a long time. Optimistic that their father return will make their life better, Boy soon realize the true sentiment of his father towards them.