>>2169786DOA is a fighting tournament. Most of the non-ninja girls just enter normally to compete for prize money, fame, and world ranking. The ninja characters enter the tournaments for reasons that are more directly involved with the hidden agenda of the main sponsor of the tournament, DOATEC, which is to create supersoldiers using the dna of the most powerful fighters in the world, namely the ninjas of the Mugen Tenshin and Hayabusa clans. With Helena's official takeover of DOATEC at the end of DOA4, the ninjas no longer enter the tournaments, and their fights are more about taking out the cloned versions of themselves that were created by MIST, the r&d division of DOATEC.
