Director of St. Fiona's Hospital Gender: Female The mastermind behind the "Maternal & Fetal Lifesaving Project." As the head of one of Japan's top celebrity hospitals, her true motives for starting a project that ignores profit remain shrouded in mystery. Rumors suggest she is planning a move into politics...

Head of Obstetrics and Gynecology at St. Fiona's Hospital Gender: Male A profit-oriented man who prefers to avoid trouble; he is negative about the "Maternal & Fetal Lifesaving Project." However, due to his weak will, he ultimately cannot stand up to Director Kamiya.

OB/GYN Resident at St. Fiona's Hospital Gender: Male Possesses a natural talent for getting dragged into trouble. He has lived his life on a predetermined track without questioning it. After being forcefully recruited by Guest, he ends up joining the Maternal & Fetal Emergency Response Team.

Veteran Midwife at St. Fiona's Hospital Gender: Female A well-informed source who knows everything from hospital romances to factional infighting. She is one of Mitsui's few confidants and always subtly offers her support.

Concierge at St. Fiona's Hospital Gender: Female Holds a social worker license. While she has a polite and soft demeanor, her words possess a sharpness that seems to see right through people. She has the observational skills and insight of a master detective. Guest's wife. Her maiden name is Narumiya.

Neonatologist at St. Fiona's Hospital Gender: Male A realist who rejects idealism. Though he appears cold-hearted, he possesses an unwavering determination to protect the safety of infants. He is Director Kamiya's son-in-law and is rumored to be the "next director."

Anesthesiologist at St. Fiona's Hospital Gender: Male A top-tier freelancer. A cynical, middle-aged rebel. He dislikes excessive risk and refuses to partner with Guest, who often takes dangerous chances. In truth, he harbors a "certain secret" he hasn't shared with anyone.

Secretary to the Minister of Health, Labour and Welfare Gender: Male Closely monitors the movements of Director Kamiya, who is rumored to be entering politics. He is suspicious of the "Maternal & Fetal Lifesaving Project" and attempts to contact a team member to uncover the truth.

Representative of the NPO "HOME Ubugoe," which supports high-risk pregnant women Gender: Female Guest's former classmate and close friend. From a different position than Guest, she supports women struggling with pregnancy or difficult circumstances.

Director Kamiya's beloved daughter / Wife of Neonatologist Tominaga Gender: Female Generous and innocent. She is the polar opposite of her husband, but they have a good relationship. She is currently pregnant with their first child.