In the 2025 film *Meitantei Conan: Sekigan no Flashback*, Ran Mōri actively participates in the investigation into Inspector Yamato Kansuke's past. She travels to Nagano Prefecture with Conan Edogawa, becoming entangled in incidents tied to an eight-year-old gun store robbery and a recent avalanche that injured Yamato. During a nighttime ambush in the Yatsugatake Mountains, Ran leverages her martial arts skills to aid Mitsuhiko Tsuburaya and Genta Kojima in repelling an attacker targeting Inspector Yui Uehara and the injured Yamato. This intervention occurs as the group moves to investigate a shooting incident, highlighting her readiness to protect others under threat. Later, she collaborates with law enforcement and Conan to prevent an avalanche triggered by the culprit at a mountain hut, ensuring the group's safety. Her involvement culminates at the Nobeyama Radio Observatory, where she aids Ai Haibara, Professor Yutaka Ochi, Conan, Kogoro Mōri, and police in capturing the culprit. While the film does not explore new dimensions of her personal background or emotional growth, it reinforces her established traits: physical prowess from karate training, commitment to investigative assistance, and willingness to confront danger to shield others.