Nasuno Takamiya is a 16-year-old second-year high school student from an immensely wealthy family, leveraging her resources to fund unconventional ventures for herself and peers. Following a journey to Ngaoundéré, Cameroon, she impulsively joins her school’s tennis club without prior experience or aptitude, engaging minimally in actual tennis while interacting with fellow members. Her conduct shifts with group dynamics: alongside tennis clubmate Yuri Oshimoto, she actively partakes in eccentric activities, yet becomes the comparatively grounded observer of others’ oddities when Yuri is absent.

Her dedicated spin-off series, *Takamiya Nasuno Desu!*, unfolds during summer break at her family’s vacation cottage, where she employs Yuri’s younger brother, Yota Oshimoto, as her butler. She assigns Yota diverse duties—from routine chores to whimsically intricate missions—prompting him to serve as the rational counterweight to her caprices and her family’s quirks. Her mother, Ayano Takamiya, possesses a remarkably youthful appearance and exhibits spirited, occasionally blunt behavior, joining their escapades with casual spontaneity. Nasuno’s father, visually reminiscent of Colonel Sanders and occasionally called Alfred, completes a family unit defined by eccentricity, consistently positioning Yota as the stabilizing force amid their unconventional antics.