A 16-year-old male student from Teitan High School. He is generally rational and calm. Driven by strong curiosity, he can also be hot-blooded and often takes reckless risks.

A 16-year-old female student from Teitan High School and Shinichi's childhood friend. While she has a kind and caring personality, she also possesses a tough, tomboyish side, demonstrating her karate skills in dangerous situations.

A 22-year-old woman and a popular singer and actress. Invited as a guest performer for the Symphony's departure party, she is bright and cheerful. She is humble and kind, maintaining her composure even when caught up in incidents.

A 41-year-old male Inspector at the Tokyo Metropolitan Police Department. A veteran officer who is strict and values principles, he is warm and generous at heart. He boarded the ship to capture an internationally wanted criminal.

A 28-year-old female detective at the Tokyo Metropolitan Police Department. She boarded the ship following Megure. As a detective in the violent crimes unit, she possesses excellent marksmanship, judo, and driving skills. She has a strong sense of responsibility, never tolerating injustice and risking herself in dangerous situations.

A 25-year-old man and the doctor in the Symphony's infirmary. He is a handsome man with a soft yet intellectual impression, suited by his wavy brown hair and glasses. He holds firm convictions regarding his mission as a doctor and is highly regarded for his constant kindness.

A 27-year-old woman and the nurse accompanying Araide. She has an innocent personality and finds it difficult to get angry.

A 38-year-old woman and a famous female author who won the Naomoto Prize. She has a cool-headed and sharp personality.

A 50-year-old man who approaches those around him in a friendly and sociable manner.

A 22-year-old man and a waiter at the Symphony's bar. He is quite skilled in the art of romance.