Fearing the safety for his grandchildren , Mori agrees to aid Koga .
Koga forces Mori to tell him the location of the Cave of Gold ; an urban legend which the sword and dagger are the keys to open .
Fearing the safety for Mori 's grandchildren , Mori agrees to Koga Koga .
Koga forces Mori to tell him the location of the Cave of Gold ; an urban legend which the sword and dagger are the keys to open .