狂暴凶狮第二部

Years after an alien invasion almost extinguished human mankind, refugee on a secret base on the Moon, three heroes decide to jump into a time travel in the desperate attempt to save the survivors but they don't know that the Sentinel is waiting for them.。片山在一次营救人质中让警方出了糗，被停职，后来无意中卷入了一场投毒案，在奉命调查此案时，认识了姐妹俩：真子和直子，片山暗中保护姐妹俩，几次解救姐妹俩于危难之中，姐妹俩深深感激，对片山渐渐从怀疑变成了信任。投毒案幕后的真凶是谁？片山和姐妹俩的感情有何发展呢。