Mina is a ghostly young woman who resides in the abandoned house that Reiji Kirio purchases to convert into his drugstore. She is one of the central female characters in the series, though she prefers to think of herself not as a ghost but as the house’s protective deity. With very long blonde hair and blue-green eyes, she appears as a teenage girl and is capable of manifesting a solid human form for extended periods thanks to the spiritual energy she accumulated during years of solitude.

Her background begins with her lingering in the empty building after her death, unable to leave the premises. Initially shy and hesitant, she eventually reveals herself to Reiji and becomes a full-time member of his household. She carries out most of the domestic chores—cleaning, organizing, and maintaining the shop’s living quarters—and takes pride in her work. Her personality is polite, diligent, and calm, often serving as the voice of reason when the energetic werewolf girl Noela becomes too boisterous. Despite her gentle demeanor, she has a playful side: she fantasizes about silly things such as developing eight-pack abs and eating chocolate, and she enjoys the comfortable, homey life that Reiji’s drugstore provides.

Mina’s primary motivation is to belong somewhere. Before Reiji arrived, she haunted the empty house in loneliness. After joining the drugstore’s family, she gains a sense of purpose and belonging, caring for the shop and its inhabitants. She deeply respects Reiji for allowing her to stay in her home without forcing her to leave, and she forms a close, sisterly bond with Noela, often playing and eating together. Her relationship with Reiji is that of a loyal helper and friend; she is grateful for the pendant heirloom he discovers in the basement, which frees her from the house and allows her to travel outside by carrying the pendant with her.

Her notable abilities stem from her ghostly nature. She can interact with physical objects normally, clean and perform household tasks, and maintain a solid appearance for long durations. She is also able to move freely once her pendant is retrieved, though she remains tethered to it. Throughout the series, her development focuses on overcoming her past loneliness and embracing her new role as a valued member of the drugstore’s daily life, transitioning from a forgotten spirit to an indispensable part of the community. She handles the domestic side of the shop while Reiji focuses on potion-making, making her a steady and reliable presence in the slice-of-life rhythm of the story.