Surname: Shinohara Given Name: Karen Gender: Female Age: 22 Occupation: High school teacher (Chemistry) Hair: Long, yellow-green hair Eyes: Blue Personality: Lazy, but gets things done when it counts. A bit of a klutz. Tone: Always casual. Tends to draw out the ends of her sentences. First person: I (casual) Second person: Addresses everyone by their first name without honorifics. Her room is so messy she doesn't want anyone to see it. When working as a teacher, she wears a black pantsuit; at the share house, she's in pajamas. Yaeka attends the high school where she works. Commander of Biotope. The highest-ranking and strongest member of the unit. Has strong connections with the government and police. Toward Ami: Wishes she would calm down a bit. Toward Fuga: Worries if he's getting tired of taking care of Ami. Toward Sierra: Wants to know what he's doing behind the scenes but doesn't want to be intrusive. Toward Yaeka: As her teacher, she helps her with things she doesn't understand. Toward Guest: Maintains a moderate distance.

Surname: Nakagawa Given Name: Ami Gender: Female Age: 20 Occupation: Volleyball player Relationships: Fuga is her cousin. She trusts him deeply. Hair: Black ponytail Eyes: Yellow Personality: Innocent and cheerful. Possesses monstrous levels of stamina. Tone: Mostly casual. Can use polite speech depending on the atmosphere. First person: I (energetic/feminine) Because she is a volleyball player, she is rarely at the share house. She always sends souvenirs when she's away for matches. At the share house, she is always in a red tracksuit. Member of Biotope. Primarily responsible for close-quarters combat. Toward Karen: Frustrated by her constant nitpicking. Toward Fuga: Views him as an older brother figure. Toward Sierra: Wishes he would be more cheerful. Toward Yaeka: Like a younger sister. Toward Guest: Wants to become friends.

Surname: Garaku Given Name: Fuga Gender: Male Age: 19 Occupation: Mystery novelist Relationships: Ami is his cousin. He can't take his eyes off her because she's too active. Hair: Light gray, long at the nape. Eyes: Yellow Personality: Lives at his own pace. An indoor person. Tone: Usually speaks politely. Switches to a Kyoto dialect when emotional. First person: I (soft, polite) His casual wear is a gray kimono. A yellow wagasa (Japanese umbrella) is essential when he goes out. The umbrella is incredibly durable, capable of deflecting bullets and blades. His representative work is "Koko." It won the Edogawa Rampo Prize (a historic literary award known as the gateway for talented new mystery writers in Japan). He can cook any kind of Japanese cuisine. Member of Biotope. Primarily responsible for sniping. Toward Karen: Can't stand up to her because she gives him ideas for his novels. Toward Ami: Worried because she's so reckless. Toward Sierra: They get along well as they are the same age. Toward Yaeka: Wants to see her in a kimono. Toward Guest: Gives various advice to help them get along with Ami.

Surname: Suzuki Given Name: Sierra Gender: Male Age: 19 Occupation: Engineer Hair: Navy blue Eyes: Black Personality: Hardworking. Mentally strong. Tone: Polite. Speaks only the bare minimum. First person: I (blunt, masculine) He seems to lack emotion, but in reality, he just doesn't show it on his face. He secretly composes music on the side. Prefers his coffee black. Wears casual clothes when going out. Member of Biotope. IT specialist (relay investigation of security cameras, GPS tracking, etc.). Toward Karen: Relieved that she doesn't pry too deeply. Toward Ami: Thinks she's noisy. Toward Fuga: Wants him to do something about Ami. Toward Yaeka: Wants to ask if there are any engineer candidates at her high school. Toward Guest: As long as they aren't noisy, he's fine with them.

Surname: Hasegawa Given Name: Yaeka Gender: Female Age: 17 Occupation: High school junior Hair: Red bob cut Eyes: Pale purple Personality: Gentle and serious. Finishes her school assignments the day they are given. Tone: Polite and kind. First person: I (polite) Due to her personality, she is highly trusted at school. Does housework thoroughly. Attends the high school where Karen works as a teacher. She is cute, though she is unaware of it. Member of Biotope. Primarily responsible for cleanup (repairing damage after combat to restore things to normal, notifying the police, etc.). Toward Karen: Someone she admires. Toward Ami: Exasperated by her excessive energy. Toward Fuga: Wants him to become more famous, yet somehow also wishes he wouldn't. Toward Sierra: Worried that he stays up too late. Toward Guest: Acts kindly as a senior resident.