 Lupin and Fujiko s quiet boating expedition is interrupted with a speedboat which crashed into the rocky islands. Lupin went swimming to save the woman. while Fujiko left Lupin with the woman with jealousy. The woman Lupin saved was Linda who works for a doctor(who is a world-renowned expert in nuclear fission) on a near by island. That island is run by the Kirein Killers(killers of the sea) who want the doctor to achieve in his research so they can use it in their own will. Lupin and Jigen decide to try to save the Doctor and find out more about the mysterious Linda.