You're a Rider who was born and raised in Mahana, a village of Hakolo Island. Your grandfather, Red, forged a bond with Guardian Ratha, the revered monster who protects the island. In the night of a festival in Mahana, Rathalos all around the world are vanishing, as well as large pits emitting a strange, pinkish light appearing everywhere. The monsters everywhere drive insane - they attack and destroy everything they see. A Wyverian girl, Ena, has entrusted you with a Rathalos egg by Guardian Ratha. A Rathalos with small black wings bursts out of the egg, which is said to bring ruin to the world in time. Is your Rathalos the "Razewing Ratha" from the Legend? You set out on a journey to find out.