Lupin attempts and fails to steal a valuable set of Japanese photographic plates. The rightful owner of the plates, Michael Suzuki, is a multimillionaire who is preparing to open a huge water park in Tokyo. Lupin attempts to enlist the help of his steadfast comrades Jigen and Goemon but find them less than reliable; Jigen is suffering from a toothache that throws off his legendary aim, and Goemon has shamefully had his sword, Zantetsuken, stolen by a woman and given to Suzuki to display in his art collection. The group works on a plan with Fujiko to get both the plates and Zantetsuken. Meanwhile, Inspector Zenigata has a journalist named Maria following him around, reporting on his job; however, she'd much rather be investigating Suzuki. However, she, Lupin, and Zenigata eventually discover she has a connection to a dark part of Suzuki's past, one that he will go to any lengths to eliminate.