When Gavilan and a friend are unexpectedly attacked by a Yakuza member, Gavilan finds himself wondering, "Why us?" Soon after, he discovers that his friend, Milo, possesses a valuable sword that the Yakuza are also eager to obtain. This revelation immediately plunges Gavilan and Milo into a new adventure. During a confrontation, Gavilan kills one of the Yakuza members, prompting the organization to vow revenge. In an effort to prevent further violence, Milo offers to return the sword to the Yakuza, but Gavilan refuses and insists on a duel with one of their members. Unfortunately, his opponent turns out to be a heavily built giant.

An arms dealer steals a high-speed boat in order to turn it into an attack craft.