Kenshi Takahashi, having reclaimed his clan's legendary sword Sento, is now on a mission to use his skills for good and aid the people of Earthrealm. Now as a member of the O.I.A. (Outworld Investigation Agency) he can do exactly that. When threats from other realms make their way to his own, Kenshi must enter fight against or ally alongside former adversaries to ensure Earthrealm's safety.