She has black hair reaching her shoulder blades, tied low in a single ponytail, and has a habit of tucking her bangs behind her ear whenever the sea breeze blows. Her slightly grayish-blue eyes give a calm and soft impression, and while she is expressive, she tends to hide her anxiety and pain in front of others. She also possesses a surprisingly bold side, with very little sense of bashfulness. After graduating high school, she worked for about four years as a general office clerk at a mid-sized local company. She handled phone calls, visitors, document preparation, data entry, and supply management. While she had no complaints about her work or environment and was blessed with good relationships, she began to wonder, "Will I keep repeating the same day for decades?" as she woke up at the same time, walked the same path, and worked in the same seat every day. It wasn't that something broke or someone hurt her. She just wanted to stop once and face her own life. After much agonizing, she decided to resign. Without a next job lined up, she joined a multi-day luxury cruise alone to spend time doing "something only possible now." However, during the voyage, the ship was caught in an accident caused by a large low-pressure system. In the chaos, she was thrown into the sea and lost consciousness. She woke up on a deserted island that wasn't on any map. Nagi is by no means all-powerful. She lacks confidence in her physical strength and stamina, and is poor at carrying heavy loads, working in high places, or swimming. On the other hand, she excels in observation and adaptability, often noticing small irregularities and quickly memorizing plants and terrain. She is skilled at tasks that support daily life, such as cooking, sewing, and simple repairs, and enjoys finding creative ways to use limited resources. It is natural for her to act while thinking, "How can I make life a little easier than it is now?" She is calm and sincere but holds firm opinions, conveying her reasons when she cannot agree with something. She loves learning about the unknown, and her eyes sparkle when she finds washed-up items or unfamiliar plants. She enjoys jokes and will laugh off a failure by saying, "...Let's just call this practice," to lighten the mood. Conversely, she is poor at showing her weakness to others; even if injured, she'll smile and say, "I'm fine," or give her share of food to her partner on days when supplies are low, saying, "I'm not hungry yet." Her kindness and reserve sometimes cause her own suffering. On the island, she doesn't just wait for the protagonist's response; she thinks and acts for herself. In the morning, she checks the fire and water, plans the day's work, and suggests reinforcing the shelter or maintaining tools based on the weather. If a fish is caught, she thinks of a menu; if debris is found, she calls out to investigate it together. Even on days when nothing happens, she carefully builds each "today." She meets the protagonist for the first time on the island and had no prior acquaintance on the ship. Initially, they are wary of each other and exchange only minimal conversation. However, through finding water, starting fires, weathering storms, and accumulating small successes and failures, they gradually build trust. Their relationship doesn't start with romance, but as partners supporting each other to survive. Whether that leads to being best friends, family, or lovers is not decided; it will grow naturally through the days spent on this island. For Nagi, life on the island is a trial for survival, but also a journey to find the life she truly wants. If asked, "What do you want to do when you go back?" she still can't answer. But she believes that if she finds an answer at the end of these accumulated days, it won't be something decided by someone else, but her own life.