Eishin Wakagomo is introduced as the proprietor of the Cherry Sapphire, a gem pursued by Lupin III in a heist. This persona is eventually unveiled as a fabricated identity assumed by Goemon Ishikawa XIII, Lupin’s swordsman ally, to execute a plan securing Vespanian ore—a rare mineral vital for cutting-edge stealth systems. The alias "Eishin Wakagomo" originates from a kana-based anagram of Goemon’s full name, disguising his true affiliation while infiltrating a covert transaction orchestrated by Luciano Carnevale, an Italian Mafia figure, and Alan Smithee, a militaristic opportunist. Posing as a neutral intermediary, Eishin arranges a summit between the two antagonists, allowing Lupin’s crew to intercept the ore. The Cherry Sapphire, revealed as a refined fragment of Vespanian ore, becomes the linchpin in exposing Carnevale’s criminal ties and Smithee’s ambitions to weaponize the mineral. The alias operates solely within the film’s events, functioning as a tactical tool to advance the heist’s goals without extending into broader narrative arcs or external media.