WARNING: All Spoilers Unmarked! Based on how the work is choreographed, various tropes here contains major plot spoilers!
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The Six Survivors
Iku Sanada
The main character of the manga. He tries several times to find the criminals, but comes to the conclusion that he is one too, since he believes himself to have caused the death of one of his classmates by removing the bar that had pierced her back after the accident, at her request. Even if he did not remove the bar, the bus explosion would have killed her and burned her alive. It is revealed he had killed his mother due to complications from his birth leading to his father becoming an alcoholic.
Rika Konno
A young idol, who was forced to abandon her career following an injury to the right eye caused by the accident, is still obsessed with having fans and her looks. She is manipulated by Mitomo, who tells her that Sanada and Amano are the culprits of the accident. This leads her to capturing them both and burning Amano's house down, unaware that they survived.
- Break the Cutie: By far the biggest example in the story, going from a promising idol to a possible murderer.
- Idol Singer: Was one before the bus crash. Having to abandon her career is one of the main causes for her breakdown.
Eiji Amano
A quiet student, whose brother works in the hospital where strong sleeping pills had been stolen. Because of this, he is seen as a suspect by his comrades. Under Mitomo's manipulation, he gets seriously injured by Konno, but survives with Sanada's help and hiding in a storage space. It is revealed he is stressed due to his parents pressuring him to succeed like his older brother.
- The Unfavorite: His parents favor his older brother and pressure him to be like said brother.
Tsuyoshi Odzu
A red-haired teenager who is Sanada's best friend and saved his life at the end of the series when Mitomo tries to hang him. Odzu had injured his left arm in the accident which caused him to wear a cast. He was in love with a classmate, a girl named Kisaragi, and feels guilty of her death since they exchanged seats shortly before the accident.
- It's All My Fault: He feels responsible for Kisagari's death in the bus crash, as he traded seats with her prior, resulting in her being in a position where she was killed.
Ryoko Kunikida
A girl who takes care of other people to divert attention to the fact that she apparently killed Futami, accidentally, who she was in love with. Her version of the story is she accidentally made him fall from the roof of the school, during a discussion caused by her jealousy.
Yukito Shima
A chubby teenager, who killed a classmate in a fit of rage just after the accident.
- Whatever Happened to the Mouse?: He vanishes completely after he's arrested following his suicide attempt. We never hear what happens to him after the fact.
Others
Shinichi Mitomo
The school guidance counselor who accuses three of the accident survivors of being murderers. A mysterious person, he seems to have a hidden agenda and to know more about the accident than he lets on.
In truth, he is the real mastermind. After discovering that Ami Toono, his half-sister, was pregnant, Mitomo planned to kill every boy in her class, especially the surviving male members, by manipulating them into turning on each other and manipulating Konno to do his bidding.
- Big Bad: He set everything up to get the students to turn on and kill each other as revenge for one of them impregnating his half-sister before he could.
- Even Evil Has Loved Ones: Subverted; he did this all to avenge his half-sister Ami Toono, but it is made clear that his feelings towards her are that of lust.
- My Sister Is Off-Limits: The usually comedic trope gets Played for Horror to its logical extreme. He masterminded the murders of the students, turning them against each other, because he was pissed that someone impregnated his sister before he could and decided to take down the whole class to get at one guy.
- Psycho Psychologist: The school guidance counselor who also happens to be the most psychotic character in the story, as he held an incestuous lust towards his own half-sister and tries to manipulate his students into killing each other because one of them dared to deflower her before he could.
- Villainous Incest: He lusted over his sister and tried to manipulate students into killing each other just to get back at the one who impregnated her, all of which is meant to emphasize what a disgusting human being he is.
Shun Futami
A classmate of the suspected six survivors. Due to catching a fever, he did not go on the field trip. Leaving a suicide note behind, he jumps off the roof and dies. In the note, he reveals he has survivor's guilt, but his mother and Sanada did not believe this was the case. After finding evidence proving he was never suicidal, Sanada puts the clues together and finds out it was Kunikida who wrote the note and accidentally forced Futami to jump off of the roof after confessing her unrequited love for him.
- Survivor's Guilt: He apparently committed suicide because he was absent from school during the day of the accident which resulted in the death of his girlfriend, and he felt guilty because he believed that if he were present, he would have been able to save her and some other friends. Subverted, since he didn't actually commit suicide. He fell to his death during an argument with another girl, who then faked his suicide note because she was afraid that she would be charged with his murder if the police found out about the true circumstances of his death.
Ami Toono
A classmate who died in the bus accident. Shima liked her due to her kindness. Toono was dating Futami and was pregnant with his child. It is believed Futami committed suicide due to her and the baby's death. During the accident, Sanada believes he killed Toono by pulling a metal rod out of her back, but that was not the case since she would have been burned alive otherwise. Later, it is revealed Toono is Mitomo's sister and that Mitomo had a one-sided incestuous love for her.
- The Lost Lenore: Subverted; she initially appears to be this for Shinichi, who went nuts after she died in the bus crash, but he only lusted for her and was always crazy.
Ryou Shimizu
A classmate who is a known heartbreaker that was killed after the bus had crashed. When the accident had occurred, Shimizu was trapped under seats. He bribes Shima to save him implying he would use Toono and then throw her so Shima could pick her up in an emotional state. Due to this, Shima kills Shimizu by bashing his head in multiple times.
