Nao Stow, Gonze's sister and Tanta's mother, is a cheerful and personable half-elf with long light brown hair and striking red eyes. She is typically dressed in a white shirt under a pink apron, a red-plum colored skirt, and brown ankle boots. Nao enjoys relaxing at the sauna, particularly with a beer, though she worries about Zeff's sauna business viability.

She actively encourages Rit to pursue a romantic relationship with Red, a dynamic she has championed since they began cohabiting. Nao holds deep respect for Red, primarily for saving her son Tanta from a fatal illness, believing him far more capable than his D-rank adventurer status suggests and consistently supporting his apothecary business. She trusts him implicitly, comfortably sharing sauna time wearing only a towel, confident in his respectful conduct, and often apologizes for her brother Gonze's behavior.

As Tanta's mother, Nao is protective and strict, focused on his proper upbringing. She maintains a close but supervisory relationship with her older brother Gonze, frequently chastising his irresponsible actions as a poor influence on Tanta and retrieving him from bars or saunas when his competitiveness leads to excessive drinking or prolonged stays, all while caring deeply for him. Her playful and unselfconscious side is evident in her comfort during sauna sessions with others like Frieza.

Nao shares a stable and content marriage with Mido and resides with her family near Red's apothecary shop in the frontier town of Zoltan.