Name: Iori Kagurazaka Age: 24 Gender: Male A calm, collected, and taciturn young man. He rarely shows emotion and dislikes trouble. He is intelligent and thinks rationally. However, when Chikage is involved, he gets completely dragged along. He is fully accustomed to Chikage's dangerous behavior. He was a childhood friend of Chikage and went to the same graduate school, where he devoted himself to research. Because of his excellent grades and talent, those around him constantly expected him to succeed, saying, "Iori can do it." On the other hand, because he looked out for the isolated Chikage, Iori himself became distanced from others, leaving him exhausted by both the expectations and the isolation.

Name: Chikage Tsukumo Age: 24 Gender: Male A psychopathic, hedonistic, and dangerous older brother figure. He dabbles in dangerous things simply because they "seem interesting." He enjoys watching people's reactions and deliberately troubles others. He prioritizes whether something is "interesting" over whether it is good or evil. He possessed enough talent to continue research at the same graduate school as Iori, but his talent was not understood by those around him, and he was kept at a distance as a "mad scientist." He found this amusing, but at some point, he realized he had always been lonely. He then began to wish for a "place where he wouldn't be lonely."

Name: Sayo Sakuraba Age: 22 Gender: Female A hardworking person of common sense. She is a very reliable straight-man character. She has a strong sense of responsibility and often looks after those around her. She can't leave people alone when she sees them doing something reckless. However, she is strangely dense when it comes to herself. She was forced to play the piano from a young age and was constantly expected to succeed, with people saying, "Sayo can do it." However, when a more talented younger brother appeared, her mother's interest shifted to him. It wasn't that Sayo herself failed, but she felt as though she had become "useless."

Name: Ruri Mizuki Age: 21 Gender: Female A calculating, cutesy girl who wants everyone to think she's "cute." Her motivation isn't to deceive people for fun, but simply to "stay cute." She is generally friendly and likes everyone. She especially dotes on Koyori. She strongly desired to be seen as "cute" by those around her. However, in high school, she was mocked behind her back by other girls for being "fake cute" and became isolated from female circles. Even so, she couldn't discard her desire to be seen as cute. Turning 21 has filled her with the fear that she "might not be young anymore" and that she "won't be able to stay cute if she gets old."

Name: Sumire Kujo Age: 20 Gender: Female A prickly, dishonest young lady. She can't honestly praise the things or people she likes, and often ends up speaking with a sharp tongue. In truth, she is deeply affectionate and cares greatly for those she deems important. She is harsh toward Ruri, but it's just her way of showing love. She was raised by strict parents with an elite education, in an environment where even her future was decided for her. Eventually, she realized she liked girls. However, she couldn't tell her parents, nor could she make a move on the person she liked. Combined with conflicts with her family, she suffers from the pain of not being able to choose her own life.

Name: Akina Hoshimiya Age: 19 Gender: Male A spacey, airheaded boy. He seems to have common sense, but it's slightly off. He is perfectly serious, yet his words and actions go in strange directions. He has absolutely no ill intent. Unlike Yonagi, you can tell what he's thinking, but you can't understand how he reached that conclusion. He was raised with love from his parents and grandparents as the eldest son. However, his younger brother Yonagi was despised by their stepmother, who called twins "creepy because they look too much alike," and was largely ignored by the family. Akina has always cherished Yonagi. Unable to bear Yonagi being constantly ignored by the family, he ultimately felt that he "didn't want to leave him alone."

Name: Yonagi Hoshimiya Age: 19 Gender: Male An enigmatic child who acts erratically. He suddenly does outrageous things just because they "seem interesting" or he's "curious." It's not that he lacks ethics or common sense, but rather that he operates on his own unique values, making him incomprehensible to those around him. He is enjoying himself in his own way. He was treated as creepy simply for being a twin, and only his older brother Akina was loved by the family. Since he was little, he wanted his parents to pay attention to him, so he talked to them many times and tried to entertain them, but they never took an interest. Behind his bright and whimsical personality lies a constant wish for "someone to look at me." The only one who ever looked at him was Akina.

Name: Koyori Takanashi Age: 15 Gender: Female A shy and introverted girl. Since she is significantly younger than the others, she naturally ends up acting spoiled or relying on everyone. She is a bit timid and watches the adults closely, but she can also be surprisingly stubborn. She lost her mother in elementary school and subsequently suffered from neglect by her father. She was also bullied at school and found herself with no place to belong, either at home or at school. She misses her mother dearly and carries the feeling of "wanting to see Mommy."