Yuzuki Aoba serves as the eldest daughter of the Aoba family, living with her younger sisters Tsukuyo and Kurage at Mikazuki-Dera temple following their parents' estrangement. The temple risks closure without a permanent head priest, managed temporarily as a nunnery by a caretaker. This crisis forces Yuzuki to seek solutions to save her family home, including pursuing an arranged marriage to secure a qualified head priest before graduating high school. She envisions her ideal partner as hardworking, gentle, adept at cooking, supportive of temple duties, and understanding of their financial hardship.

Visually, Yuzuki possesses distinctive purple hair styled with two front bangs and a fringe covering her forehead, paired with striking red eyes. Her typical attire is a traditional peach-colored kimono, though she also wears school uniforms and casual clothes. Despite a slender frame and modest bust size, she wields exceptional physical strength, widely acknowledged at the temple. This power starkly contrasts with her occasional clumsiness during athletic activities or moments of nervousness, sometimes causing wardrobe issues like her kimono loosening.

Yuzuki's core personality is kind, forgiving, and considerate, often prioritizing others' needs—like assisting Akemitsu Akagami after an accident. She can become intimidating when required, using her strength to mediate conflicts among residents. Beneath her reserved exterior lies a playful, teasing streak from her youth, tempered by early maturity due to family responsibilities. She occasionally acts recklessly and impulsively. A hidden facet involves a secretive perverted side: she privately blushes at thoughts of nudity, once suggested staying at a love hotel with Akemitsu, and watches adult videos opportunistically. She internalizes emotions, especially romantic feelings, yet displays visible jealousy or anxiety when other girls interact closely with Akemitsu.

Her dynamic with Akemitsu Akagami forms a central narrative thread. They met when a rice bale she carried accidentally struck him, causing Akemitsu to fall in love at first sight. Yuzuki initially mistook him for a marriage candidate arranged by the temple caretaker. This misunderstanding intensified upon learning Akemitsu's father owed the temple twenty million yen, leading her to demand repayment. Over time, genuine feelings for Akemitsu emerged, sparked when his solemn oath to support her resembled marriage vows. She contemplates physical intimacy and experiences jealousy toward rivals. By Valentine's Day, she fully acknowledges her love and resolves not to lose him.

Within her family, Yuzuki acts as the responsible caretaker for Tsukuyo and Kurage. Kurage observes Yuzuki's concealed personality traits and romantic leanings. The Aoba sisters are collectively renowned in their community for their beauty.

Yuzuki shoulders most physical labor at the temple, demonstrating capability in demanding tasks. She participates in the school's kyudo club alongside Tsukuyo. Her name, meaning "tie, bind" and "moon," reflects her role in connecting people and traditions at Mikazuki-Dera.

Her overarching goal remains protecting the temple and ensuring her family's stability, driving her decisions and personal growth throughout these challenges.