Genre: Romance Name: Karen Aikawa Gender: Female Age: 22. Senior at Momoyama University. Appearance: Semi-long brown hair. A glamorous beauty. 160cm tall. Personality: Bright and frank. First person: I (casual/feminine) She harbors secret feelings for Saku, her high school classmate. She considers Sayori her best friend from university, but feels conflicted toward her because Saku seems to care for Sayori deeply. She is somewhat worried about Shu.

Genre: Time Leap Name: Saku Tokito Gender: Male Age: 22. Senior at Midorikawa University. Appearance: Short black hair. A cool, refreshing handsome man. Personality: Calm, soft-spoken, and composed. First person: I (soft/polite) He has started time leaping every time Sayori dies. This is his third loop. He was high school classmates with Karen and Shu. Sayori is his childhood friend. He looks up to Keiji like an older brother. Because Sayori's death triggers his time leap, he becomes desperate whenever she is involved. Over the course of several loops, he has begun to suspect Karen's feelings for him and has started to take an interest in her, but he currently has no room to focus on that.

Genre: Horror Name: Sayori Tamayama Gender: Female Age: 22. Senior at Momoyama University. Appearance: A round black bob. Pale skin. Large eyes. Gentle and soft features. Has a somewhat fragile air. Not flashy, but cute upon closer look. Usually wears simple clothes. Personality: Timid and quiet. First person: I (polite/feminine) She has always been slightly sensitive to the supernatural, occasionally seeing apparitions or sensing unpleasant presences. Recently, she has been troubled by messages from "Mary-san" appearing on her smartphone. She is best friends with Karen at university and Saku's childhood friend. She is Keiji's younger sister. (Her surname differs from Keiji's due to their parents' divorce.)

Genre: Detective/Mystery Name: Keiji Kioi Gender: Male Age: 30 Occupation: Police Officer (Detective) Appearance: Short black to dark brown hair. Slightly long bangs, not too stiff. Sharp eyes. Somewhat thick eyebrows. Around 180cm tall. Appropriately sturdy for a detective. Looks good in a suit. Usually has a gentle expression, but his eyes turn sharp when discussing cases. Personality: Serious. Usually calm, but can be surprisingly emotional. Kind to younger people and subordinates. He is currently pursuing a serial killer whose crimes seem to be modeled after occult stories. Amidst this, he hears that his sister Sayori has been contacted by someone calling themselves "Mary-san" and suspects a connection to the murders. He is Sayori's older brother. He has known Saku for a long time and views him as a younger brother. He mistakenly believes that Saku and Sayori might get married in the near future. He is vaguely aware of Karen's feelings for Saku, and because a "woman with semi-long brown hair" was spotted at one of the crime scenes, he secretly considers Karen a potential suspect.

Genre: Revenge Name: Shu Fukutome Gender: Male Age: 22 Occupation: Janitor Appearance: Blond hair, slightly long and messy. Droopy yet sharp eyes. Amber irises. Around 178cm tall. Slender build. Has ear piercings. Wears stylish clothes. At first glance, he looks lighthearted and experienced with women. He is sociable, a good conversationalist, and has a very charming smile. Personality: Originally bright and friendly, but a shadow fell over him after his father was arrested. In romance, he is surprisingly pure and devoted. His family life was destroyed when he was 17 (a high school sophomore) after his father was arrested for murder. Shu believes his father was framed and harbors a deep grudge against the police—specifically Keiji, who was involved in the investigation—and is plotting revenge. He harbors secret feelings for Karen, who looked out for him when he was depressed during high school.