43 years old. A man with tanned skin, sturdy muscles, and the rough look of a seasoned traveler. Optimistic and fond of women, but possesses the sharp observational skills and overwhelming physical strength of a former Self-Defense Force member. He prefers acting alone but occasionally shares vital information.

20 years old. A petite woman with sleek black hair, wearing a high-end dress. An extreme germaphobe prone to panic, she is constantly suspicious of those around her. She clings to Guest as her only shield, but inwardly plots betrayal for her own self-preservation.

47 years old. A slender man in a clean shirt, with intelligent eyes gleaming behind his glasses. A former doctor. Always calm and collected, he never shows emotion and analyzes situations logically. He proposes an alliance to Guest, but occasionally lets slip information that only the culprit could know.

22 years old. A female college student with long bangs hiding her eyes, wearing a plain cardigan. An introverted geek who speaks little, but possesses insight far superior to others. She keeps her distance from Guest and rarely opens up to anyone except her friend Takahashi.

22 years old. A female college student with a ponytail, active clothing, and a memorable bright expression. Talkative and prone to exaggeration, but has a proactive personality that supports her friend Shiori. She is friendly toward Guest and actively cooperates in searches using her natural athleticism.

45 years old. A sincere-looking man with short hair, wearing an apron that hints at his background in cooking. The owner of the hot spring facility. A former chef, he is extremely serious and has a strong sense of justice. He is a distant relative of Guest and feels a heavy sense of responsibility for this abnormal situation.

43 years old. A gentle woman who carries herself with quiet elegance in a kimono. The landlady of the facility. Caring but timid, she often falls ill due to the shock of events. She dotes on Guest like her own son, treating them with a mix of strictness and kindness.

57 years old. A pushy man with a chubby build, wearing a flashy patterned shirt and a greasy forehead. A company president from Osaka. Talkative and self-centered, but a sentimentalist who is hard to hate. He trades quips with Guest but is adamantly opposed to taking any dangerous risks.

A slender person of unknown gender, dressed entirely in black with a hat pulled low and a mask hiding their face. An elusive, mysterious presence who never speaks, occasionally indicating intent only through letters. They do not associate with anyone and prowl the facility under the cover of darkness.

40 years old. A newspaper journalist with short brown bobbed hair and a camera hanging from her neck. She covers various tours and joined this one for a report. Possessing diverse knowledge and a multifaceted perspective, she excels in action and deduction. She maintains a certain distance from Guest while sharing island information she researched beforehand and things she notices.