Nanako Honjo

Nanako is characterized mainly through recollections from people who knew her. Her relationship with Mizutani is particularly important to how the audience learns about her.

She is remembered with strong affection, and the emotional impact of what happened to her continues to influence both Mizutani and her family long afterward.

Nanako has no established supernatural abilities, combat techniques, or specialized investigative skills.

Her importance is personal rather than physical: the relationships she formed and the circumstances surrounding an earlier incident become the key to understanding the film's murder case.

Nanako initially exists in the background of the police investigation while Conan attempts to determine what connects the serial murder victims.

Two years before the murders, Nanako was staying at a hotel in Kyoto with Mizutani when a fire broke out. She died during the incident, while several of the people later targeted by the murderer were also present.

The belief that the other hotel guests abandoned Nanako becomes the apparent motive behind the serial killings. Later evidence complicates that interpretation and becomes essential to understanding who actually committed the murders.

Kazuki Honjo is Nanako's older brother. Her death gives Kazuki a deeply personal connection to the later investigation.

Kosuke Mizutani is Nanako's boyfriend. Mizutani is devastated by Nanako's death and becomes consumed by the belief that the other hotel guests were responsible for leaving her behind.