Nao Morisaki is a student at the Central Military Academy, where she is in her fourth year of the preparatory course. She aspires to become a nurse, inspired by Florence Nightingale, and serves as a member of the academy’s medical team. Unlike many of the other cadets, she is not a combatant; her role is that of a paramedic or medic, providing first aid and medical support during emergencies.

Her personality is defined by warmth and compassion. She is kind-hearted and deeply empathetic, often putting the well-being of others before her own. This gentle nature makes her a stabilizing presence among the group. She is also described as passionate and sincere in her feelings.

Nao is childhood friends with the Aizawa brothers, Shuhei and Ryota. She is in a romantic relationship with Shuhei Aizawa, and the two are an established couple from early in the story. Their bond is strong, and they eventually marry after the events of the main narrative. She later becomes the mother of Nanami Inatsuki. Her relationship with Ryota is that of a close friend and almost a sisterly figure.

In the story, Nao’s primary function is to support the other characters, especially during crisis situations on the space station Aries. Her medical knowledge and calm demeanor prove valuable when injuries occur. She does not undergo a dramatic character arc, but her commitment to helping others and her loyalty to Shuhei remain constant. Her motivations are rooted in a desire to care for people and to be with the person she loves.

Nao is visually recognizable by her medium-length pink hair and purple eyes. Her attire typically consists of the academy uniform or a medical uniform. Her notable abilities are limited to medical training; she has no combat skills or supernatural powers. She is a grounded, human character whose strength lies in her emotional resilience and her dedication to her duties as a caregiver.