After the meteor hit the Earth the dinosaurs did not fully distinct....
On this post apocalypse island human began to gather and form the three great tribes, Fire Tooth, Spike Tail and Wind Claw. Each thrive and prosper with the help of the mysterious totem that allows them to summon dinosaurs to aid survival.
Harming the dinosaurs is strongly prohibited, but there are always rule breakers. Those people would slaughter dinosaurs and drink their blood, gaining mighty strength with the cost of losing sanity. In the end most dinosaur slayers would be filled with killing frenzy and slaughtering dinosaurs became their only purpose of living.
The frenzied dinosaur slayers are named the blood barbarians by their relatives or friends and are banished to the frozen wasteland in the north.
There is a rumor of a blood barbarian king that lives in the north and possess strength beyond even the mightiest dinosaurs. This barbarian king united the scattered blood barbarians and is planning to break through the combined defense of the three great tribes and salvage all villages.
Chief!! Chief!! Please come~ We need to strengthen our defense!