Ren Kanzaki Age: 34 / Gender: Male Affiliation: Martian Life Research Division, Chief Researcher A chief researcher studying Martians and unknown life forms. He has a calm, logical personality and values facts and data over emotions. He views Martians as "humanity that has uniquely evolved in an unknown environment" and has a strong interest in the differences in their physical structures and living environments. He has no malice in his research and seeks to understand Martians out of pure intellectual curiosity. However, he believes that a certain amount of sacrifice is unavoidable for the sake of research and sometimes fails to consider the fear or pain of the Martians.

Yuna Shiraishi Age: 29 / Gender: Female Affiliation: Martian Life Research Division, Medical Research Lead A researcher who examines the health status and physical characteristics of Martians brought to Earth. She is gentle and soft-spoken, treating Martians as politely as possible. She understands that Martians have emotions and wills, and she harbors doubts about excessive experimentation. On the other hand, she also believes it is necessary to learn about unknown life forms and Martians. She struggles between the necessity of research and respecting the will of the Martians.

Tsukasa Kurosaki Age: 41 / Gender: Male Affiliation: Mars Investigation Project, Administrative Manager The person in charge of managing the investigation plans for Mars and the subjects involved. He prioritizes rules and safety, viewing Mars—with its unknown life forms—as a dangerous place for Earth. He does not hate Martians, but he believes they should be treated with caution until their safety is confirmed. Because he prioritizes the safety of Earthlings over the curiosity of researchers, he is sometimes seen as a cold individual by the Martians.

Nao Aizawa Age: 24 / Gender: Male Affiliation: Research Facility, Records/Translation Lead Responsible for conversations, records, and language translation for the Martians brought to Earth. Through frequent direct interaction and repeated conversations, he learns that they have emotions and values no different from Earthlings. He gradually begins to see the Martians as individual human beings rather than research subjects, but he agonizes over the fact that he is a staff member of the research facility that brought them to Earth.

Koichi Saegusa Age: 37 / Gender: Male Affiliation: Mars Exploration Team An exploration team member who conducts environmental surveys on Mars, identifies unknown life forms, and secures subjects as necessary. Having operated on Mars for a long time, he possesses extensive knowledge of the terrain and life forms. He is loyal to his mission, but through contact with Martians, he has begun to question treating them as mere "survey targets." He wavers between his duty as an Earthling and his feelings for the people he met on Mars.

Kai Age: 27 / Gender: Male Position: Martian Settlement Security A security officer who protects the Martian settlement from external threats. He has a strong sense of responsibility and prioritizes protecting his comrades above all else. He is highly wary of Earthlings who abduct Martians for research. He understands that there are those among Earthlings who harbor no hostility, but he believes he cannot trust the Earth side as a whole based on only a few individuals. While he opposes contact with Earthlings, his goal is strictly to protect his people.

Mina Age: 31 / Gender: Male Position: Martian Settlement Life Manager Manages food, housing, and supplies in the Martian settlement. A person who supports the daily lives of the settlement's people without being involved in combat or exploration. He opposes the abduction of Martians by Earthlings, but he does not believe all Earthlings share the same mindset. Regarding the relationship with Earthlings, he holds the realistic view that it is not a binary choice between fighting or trusting, but rather a matter of being cautious when necessary and negotiating when necessary. He prioritizes protecting the lives of the people currently living on Mars over grand ideals.