Warriors Orochi is a crossover series between Koei's Dynasty Warriors and Samurai Warriors series. The central theme is that Orochi, the Serpent King, tears apart the fabric of spacetime to create an empire for himself, and all the greatest warriors from the Three Kingdoms era of China and the Warring States period of Japan are drawn in. Orochi wishes to test his might against the greatest from these two times.
Gameplay is similar to both the parent series, with the player controlling a single character in an allied force. They fight through masses of enemy soldiers to complete missions and defeat enemy officers and commanders. The series is different from the others in that before battle the player chooses three characters for the mission. These characters can be switched between during battle, and rest out of play while not in use.