In Bora Bora Island, Mako's dad dies along with 2 other fisherman due to a shark, named Tupa, killing them all.Tupa thinks the island is his, Causing everyone to give him food so he spares the tribes. The prize for killing Tupa is 3 acres of land and a sailing boat.
To avenge his father's death, Mako is Determined to kill Tupa
So Mako and his dog, Afa, goes to a forest to get bananas for his tribe at the day time, as for the matter fact Tupa only comes out at night.
When Mako is almost home, Tupa appears and fights Mako, even though Mako is a little kid.
Mako gets courage to attack Tupa in the eye 3 times. But on because his only companion's life was at risk. After killing him, Mako drags his body to shore to show proof that he killed Tupa.
After Tupa's death, Mako's tribe celebrates and award him and his family 3 acres of land & a boat, Not only thanks to his dog, but to his father as well.