故事背景设定在一个名为西弗敦的小镇，在同一天中，史无前例的多个龙卷同时席卷这个小镇，在这些难以预测且极度致命的龙卷风群袭击下，整个小镇面临灭顶之灾。但专门研究龙卷风的追风人预测，更糟糕的情况还尚未真正到来。大多数居民都在紧迫寻找避难所，而这些追风者们却“逆向而行”赶到龙卷漩涡前，测试需要走多远才能拍到这千载难逢的极端时刻。
警官哈金卧底潜入红虎帮，并成功赢得该帮派的信任。他不仅成功揭露了他们的罪行，还必须直面这些残暴的罪犯。然而，他遭遇背叛，陷入道德困境，在不为人知的情况下为维护正义而战，他的忠诚度也受到了考验。
Kyohei Aizawa, an assassin for a covert non-governmental espionage group in Japan called "SEEK", is grieving over the loss of his girlfriend from a tragic plane accident. The leader of "SEEK",Ryo Mikumo, contacts him for an emergency mission; save a fellow agent, recover a new highly explosive liquid called "RDX@", stop a ruthless Yakuza leader, Sojiro Kotsuki, and his gang before they take over Japan. Although the Ninjas were thought to have disappeared... the new breed of assassins live on helping to protect Japan and all that is right; the Ninjas are coming soon.
