Minato Nagase is the younger sister of Jun'ichi Nagase, attending the same high school as a first-year student while he is in his second year. She spent periods living in jungle environments with their parents, cultivating survival skills and the unique ability to detect and communicate with animals through ground vibrations. Jun'ichi remained in Japan during these times. Minato excels at household management, including cooking and cleaning, and takes pride in these domestic responsibilities. The nature of Minato's familial bond with Jun'ichi shifts across adaptations. In the original PC visual novel, they are blood-related siblings. Conversely, the PlayStation 2 version, the anime adaptation, and portable versions explicitly state they are not biologically related; the anime subtly implies her adoptive status through a conversation between their parents that Jun'ichi fails to hear clearly. This distinction critically shapes her romantic storyline. Minato consistently harbors romantic feelings for Jun'ichi, though their resolution varies. In the anime, following hesitation and conflict—especially with Jun'ichi's fiancée, Yuuhi Katagiri—Minato leaves home to compel Jun'ichi to choose. He ultimately confesses his love, leading to a romantic resolution. In the manga, Jun'ichi does not reciprocate her feelings, instead entering a relationship with Yuuhi, relegating Minato to a supportive role. The PC visual novel features an optional romantic route where she becomes involved with Jun'ichi, including adult-oriented scenes. Her development frequently involves navigating jealousy and emotional conflict, particularly concerning Yuuhi. In the anime, after Yuuhi temporarily leaves the household, Minato confesses her feelings to her, resulting in a tense but ultimately forgiving interaction that underscores Minato's internal struggle between loyalty and romantic desire. The OVA depicts her in more comedic or fanservice-oriented scenarios, such as hot springs episodes, without advancing her core narrative. Minato makes cameo appearances in spin-offs like *Hoshizora e Kakaru Hashi*, visiting the setting with a friend named Yocchan; these do not contribute to her character development. Physically, she stands 162 cm tall with brown hair typically styled in a side tail, teal eyes, and measurements of 83-57-84 cm. Her personality blends kindness, maturity, and proactive behavior, though she occasionally exhibits private sulking or jealousy in romantic contexts.