In Part 6, her relationship with Lupin III reaches a significant emotional juncture during his mental breakdown induced by Tomoe's hypnotic control. Confronting him in a rain-soaked alley, Fujiko openly acknowledges their history of betrayals but asserts her resolve to reclaim him, declaring Lupin her "treasure." This encounter culminates in Lupin rejecting her attempted kiss, leaving her visibly affected yet undeterred in her determination.

The season explores her connection to the overarching conflict involving Tomoe, a manipulative figure linked to Lupin's past. Fujiko collaborates with Jigen and Goemon to counteract Tomoe's influence, demonstrating strategic coordination despite her usual preference for solo operations. Her role underscores her established pattern of alternating between cooperation and rivalry with the core group, particularly responding to threats against Lupin.

Part 6 integrates Fujiko into standalone episodes highlighting her adaptability, including scenarios where she navigates meta-fictional challenges like fan-created narratives or specialized security systems designed to counter the gang's methods. These episodes spotlight her signature traits—resourcefulness, seductive charm, and self-serving pragmatism—without altering her fundamental character dynamics.