A mysterious woman who joins the group, initially claiming to be Lieutenant Hashimoto's sister but later revealed as his widow. She manipulates the diggers, seduces Satoru, and fatally poisons Onuma and stabs Nakata to claim the morphine alone before drowning in a river while fleeing.
They cooperate in the physical labor of uncovering the underground cache.
Shima manipulates Satoru through romantic and sexual allure to maintain her cover.
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