♂ m 32

Birthday: September 22, 1997 (Virgo) Blood Type: A+ Occupation: Captain of Team A of Rokumei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Fire Lieutenant Intelligence: High Physical Strength: Very High Hobbies: Unknown Likes: Squadmates, making good on his word, value of life, bl... read more

Birthday: September 22, 1997 (Virgo) Blood Type: A+ Occupation: Captain of Team A of Rokumei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Fire Lieutenant Intelligence: High Physical Strength: Very High Hobbies: Unknown Likes: Squadmates, making good on his word, value of life, black coffee Dislikes: People who are all talk, acts of cowardice, words and actions that make light of life, hospitals Enneagram: Type 5 "The Investigator" Protagonist of √A. The captain of the rescue squad dispatched to the incident at "LABO" on request of the city. ...Or so he's heard, as he's lost his memories due to encountering some sort of trouble. It appears he had a composed and logical (to put it in a bad way, dry) personality before his amnesia, but naturally, he doesn't remember that. The story of √A begins with him waking up in LABO. With him and his companions trapped ina desperate crisis without an escape route, he could not have awoken in any worse circumstances. Prepared to do or die, he tries to search for survivors and find a way out of LABO, but the situation just gets worse by the moment... Can he carve a path through this extreme situation? And what of his memories...?

♂ m 16

Birthday: June 22, 2014 (Cancer) Blood Type: O+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: High Physical Strength: Average Hobbies: None (hasn't developed any particular long-term interests) Likes: Calm and peaceful times, his dear friends, read more

Birthday: June 22, 2014 (Cancer) Blood Type: O+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: High Physical Strength: Average Hobbies: None (hasn't developed any particular long-term interests) Likes: Calm and peaceful times, his dear friends, Yuuri's smile, hot milk Dislikes: Thoughtless actions, hurting others, crowds, his old self Enneagram: Type 7 "The Enthusiast" Protagonist of √B. A high schooler living in Rokumei City. A quiet boy who hates standing out in any way. He is by no means emotionless, but he rarely shows any passionate emotions. He is the one who is there in body, but not in spirit, as he always seems to be gazing somewhere far off. He tends to simply stick to his daily routine. He is very sensitive and quite perceptive of others' emotions. He gets very tired of being a part of groups, and is often alone. His mother (Miyoko) is a renowed scientist who is so busy at work that she rarely comes home. Therefore, Natsuhiko essentially lives alone. It seems that as a child, he was rather cheerful and mischievious, the opposite of his current self... He somehow gets trapped in LABO on September 16.

♀ f 17

Birthday: October 8, 2012 (Libra) Blood Type: AB+ Occupation: Unemployed (doesn't go to school either) Intelligence: Average Physical Strength: Very Low Hobbies: Reading (she'll read anything in print), knitting, idling around home, absentmindedly falling into daydreams Likes: Talks of love, fairy t... read more

Birthday: October 8, 2012 (Libra) Blood Type: AB+ Occupation: Unemployed (doesn't go to school either) Intelligence: Average Physical Strength: Very Low Hobbies: Reading (she'll read anything in print), knitting, idling around home, absentmindedly falling into daydreams Likes: Talks of love, fairy tale endings, being warm and comfortable, talking to Natsuhiko, hospital examinations Dislikes: Being hungry, shivering, cruel stories, seeing others sad Enneagram: Type 9 "The Peacemaker" Natsuhiko's childhood friend. In √B, she lives at Natsuhiko's house for some reason. She's bad at household chores, so she's no help on that front. In all truth... she is quiet and of few words, so she almost never talks to anyone. She eats dinner with Natsuhiko, and listens to what he has to say without talking back, and she's always on his side. But her presence is very comforting to Natsuhiko, and is precious to him. She somehow gets trapped in LABO on September 16. In √A, she is rescued shortly after the start of the game. She keeps her silence and barely speaks to anyone, so no one can tell what she's thinking. On top of that, she has bad reflexes and no stamina, so she's mostly a burden.

♀ f 20

Birthday: March 25, 2010 (Aries) Blood Type: O+ Occupation: Member #4 of the Rokumei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Firefighter Intelligence: Average Physical Strength: High Hobbies: All kinds of sports, patchwork Likes: Effort, friendship, justice, honesty, being t... read more

Birthday: March 25, 2010 (Aries) Blood Type: O+ Occupation: Member #4 of the Rokumei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Firefighter Intelligence: Average Physical Strength: High Hobbies: All kinds of sports, patchwork Likes: Effort, friendship, justice, honesty, being thanked by those she resuces, heroes, rock music, "Sis" Dislikes: Hesitation, cowardice, betrayal, lies Enneagram: Type 8 "The Challenger" A rookie rescue worker. She's still a greenhorn, but no one can surprass her when it comes to passion. She admires heroes of justice who defeated the strong and protected the weak, so she wants to become one. Having becoming an elite firefighter and rescue worker at her young age shows that she has outstanding talent much like Kazami. She is incredibly dexterous. Her nimble fingers allow her to free people trapped in machinery and untangle any mess of rope or cable during a mission when seconds count. Though it clashes with her image, she's taken up knitting as a hobby to improve her dexterity skills.

♀ f 13

Birthday: November 1, 2016 (Scorpius) Blood Type: A+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: Very High Physical Strength: Greater than it looks (she's particularly good at aikido-esque techniques) Hobbies: Reading (especially sci-fi novels) Likes: Sci-fi... read more

Birthday: November 1, 2016 (Scorpius) Blood Type: A+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: Very High Physical Strength: Greater than it looks (she's particularly good at aikido-esque techniques) Hobbies: Reading (especially sci-fi novels) Likes: Sci-fi works, being alone, building up her knowledge and fighting techniques, looking at the stars, delicious food Dislikes: Idle conversations and ambiguity, empty words, having her personal space intruded upon, hunger Enneagram: Type 4 "The Individualist" Half-Japanese, half-French. A young yet bright genius who skipped two grades. "Yui" is her middle name, while "Louise" is her first name. "Salyu" is her nickname. A girl with a difficult to approach air about her that contains a mystique far removed from normal people. She is of very few words, and her expression rarely changes. She's not oppressive, but nor does she attempt to make any friends of her own. Despite that, she appears actively conscious of Natsuhiko. She constantly carries a ferret mascot-type robot called "Alice". She transfer into Natsuhiko and Mashiro's high school early on in √B. It appears she's a distant relative of Natsuhiko's, as she moves into Natsuhiko's house right after she transfers... She somehow gets trapped in LABO on September 16. Furthermore, she runs away from the rescue squad after they find her and try to save her. A mysterious girl indeed.

♀ f 28

Birthday: January 13, 2002 (Capricorn) Blood Type: A+ Occupation: Lieutenant/Member #1 of Team A of Rokurei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Fire Sergeant Intelligence: High Physical Strength: High Hobbies: Collecting classical music, training Likes: Rational actions,... read more

Birthday: January 13, 2002 (Capricorn) Blood Type: A+ Occupation: Lieutenant/Member #1 of Team A of Rokurei City Fire Department's Special Elite Rescue Squad "SIRIUS" Rank: Fire Sergeant Intelligence: High Physical Strength: High Hobbies: Collecting classical music, training Likes: Rational actions, thinking how to improve, being strict on herself, her family Dislikes: Foolish words and actions, letting down her walls, deviating heavily from the rules, life stories, romance (because she's bad with it) Enneagram: Type 6 "The Loyalist" Lieutenant of the rescue squad team. She is a capable officer who has helped out her captain up until now. With Captain Kasasagi having lost his memories due to unforeseen trouble, she takes up the role of captain in his place. She is a superb squad member, and the first female rescue worker in Rokumei City history. So far, female rescue workeres have been very rare due to stamina issues, but with her special skills such as her knowledge/handling of equipment, Kazami rose out above all the other candidates and was appointed as the first female rescue squad worker. Even in an extreme situation like that of √A, she never loses her composure and remains a woman with an iron core.

♀ f 16

Birthday: May 17, 2014 (Taurus) Blood Type: B+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: Average Physical Strength: Average Hobbies: Cooking, walks, collecting manga, watching movies, anime, and games (she even likes bishoujo games) Likes: Sweets, being us... read more

Birthday: May 17, 2014 (Taurus) Blood Type: B+ Occupation: Rokumei City Private Academy High School Section, Class 1-B Intelligence: Average Physical Strength: Average Hobbies: Cooking, walks, collecting manga, watching movies, anime, and games (she even likes bishoujo games) Likes: Sweets, being useful to others, psychology and neurology, investigating, the moon Dislikes: Sour food, cruelty, two-timing, invading others' personal spaces more than is necessary Enneagram: Type 2 "The Helper" Natsuhiko's childhood friend and neighbor. In √B, she is like Natsuhiko's own personal wife (albeit not actually married) in how she constantly takes care of him. Cooking is her specialty (though it's rough). She's not just kind and gentle to Natsuhiko, but to others as well, and so is relied on by many others. On the other hand, she's bad at relying on the others, and as such, has a bad habit of not telling her worries to others. She's very active in contrats to Natsuhiko and tries to take him around to all sorts of places, but that's because she's hoping it'll make Natsuhiko to go back to his old self.

♀ f 24

Birthday: January 20, 2006 (Aquarius) Blood Type: B+ Occupation: Teacher (Subject: Parapsychology) Intelligence: High Physical Strength: Average Hobbies: Work Likes: Lessons, students, debates, accomplishing her goals, cars, jazz Dislikes: Wasting time, days off where she accomplishes nothing, defea... read more

Birthday: January 20, 2006 (Aquarius) Blood Type: B+ Occupation: Teacher (Subject: Parapsychology) Intelligence: High Physical Strength: Average Hobbies: Work Likes: Lessons, students, debates, accomplishing her goals, cars, jazz Dislikes: Wasting time, days off where she accomplishes nothing, defeat, the naively honest people Enneagram: Type 3 "The Achiever" A teacher at Natsuhiko's school. She is an egoistic and quirky woman. She's quick-witted, an eloquent speaker, and a model when it comes to taking proactive action, so she's highly trusted by her peers. She's still inexperienced as a teacher, but her passion attracts the students and draws out their motivation. However, she's too agressive, and has a flaw of occassionally being willing to do anything to achieve her goals... She somehow gets trapped in LABO on September 16. She doesn't appear very compatible with rescue squad, as she's not all that cooperative with them and clashes with their opinions many times.

♂ m 35

Birthday: January 9, 1995 (Capricorn) Blood Type: A+ Occupation: Staff member/Junior Fellow (scientist) at the 6th Laboratory of Atomic and Biological Organization (LABO) Intelligence: High Physical Strength: Average Hobbies: Computers Likes: That which is "just", trim and tidiness, honesty, researc... read more

Birthday: January 9, 1995 (Capricorn) Blood Type: A+ Occupation: Staff member/Junior Fellow (scientist) at the 6th Laboratory of Atomic and Biological Organization (LABO) Intelligence: High Physical Strength: Average Hobbies: Computers Likes: That which is "just", trim and tidiness, honesty, research, vegetables (he's a vegetarian) Dislikes: That which is "unjust", corruption, things that don't go according to plan, meat and fish, women (because he's bad at with dealing them) Enneagram: Type 1 "The Reformer" Natsuhiko's neighbor who works as a researcher (his position is something along the lines of an assistant manager) at the research institute. He seems like an inflexible old man, but he's brimming with a sense of justice, an honest man who can be depended upon as long as injustice is not at play. He got trapped in LABO after the explosion on September 16 when he failed to evacuate in time. It seems he feels a sense of responsibility for the incident as a member of the facility's staff.

♂ m 32

A rescue worker attached to Special Elite Rescue Squad Sirius. Age 32.

♂ m 29

A rescue worker attached to Special Elite Rescue Squad Sirius. Age 29.

♀ f 15

A young girl found dead within LABO's basement doors during the lockdown.

♀ f 36

Natsuhiko's mother. A senior fellow at LABO. Due to her job as a renowned scientist, she rarely comes home.

A student from Rokumei Academy. Uses telepathy to broadcast his songs to the school, to other students' annoyance. Appears in route B.

♂ m 47

Commander of Sirius. Age 47. Rank: Battalion Chief. From his many achievements through dispatches, he received many promotions and worked his way up the ranks to Battalion Chief. Though he regrettably has not done any frontline firefighting recently, his physicality has not atrophied in the slightes... read more

Commander of Sirius. Age 47. Rank: Battalion Chief. From his many achievements through dispatches, he received many promotions and worked his way up the ranks to Battalion Chief. Though he regrettably has not done any frontline firefighting recently, his physicality has not atrophied in the slightest. He once was attached to a rescue squad himself. His tempered body and durable spirit earned him the nickname "Iron Murakami". He highly values Watase, who has a similar nickname, and has high hopes for him as Sirius' field captain.

A dog that Natsuhiko and Mashiro found as children.

♂ m 32

Natsuhiko's father. Deceased. Age 32 at the time of death. A Rank B Aptitude, Ability Level 4 Communicator, an extreme rarity before the dawning of the Grand Communicator Discovery. His wife, Miyoko Tenkawa, bore their only son, Natsuhiko, but when the child was only 5 years old, Shun passed away, l... read more

Natsuhiko's father. Deceased. Age 32 at the time of death. A Rank B Aptitude, Ability Level 4 Communicator, an extreme rarity before the dawning of the Grand Communicator Discovery. His wife, Miyoko Tenkawa, bore their only son, Natsuhiko, but when the child was only 5 years old, Shun passed away, leaving him a letter and his beloved watch.