TV-Series
Description
Mizuki Yuiga is the younger sister of Nariyuki Yuiga and the older sister of Hazuki and Kazuki Yuiga. She strongly resembles Nariyuki, sporting black hair usually in a ponytail and reddish-brown eyes. Her practical, sporty appearance reflects her role as a swimmer. At home, she frequently wears aprons featuring English messages or logos.

Cheerful, caring, and reliable within her family, Mizuki shoulders significant household responsibilities, including cooking meals and managing chores, with her culinary skills highly praised by Nariyuki. She also demonstrates proficiency in professional-level massages and haircuts. Mizuki exhibits a notable "brother complex," characterized by deep affection and protectiveness toward Nariyuki. This manifests as jealousy when other girls like Fumino Furuhashi or Rizu Ogata interact closely with him, sometimes prompting a cold or strict demeanor toward them. In contrast, she admires Uruka Takemoto, viewing her as both a role model and a romantic rival due to Uruka's relationship with Nariyuki.

Her background includes familial hardship, specifically the death of her father during her fourth grade of elementary school. This loss caused her to withdraw from school temporarily. During this period, Nariyuki provided emotional support, strengthening her attachment to him. Her recovery was further aided by meeting Uruka, whose positivity inspired Mizuki to join the swimming club in fifth grade. Swimming became a source of purpose and happiness, helping her regain confidence.

By middle school, Mizuki advanced to become the captain of the swimming club at Nanao Minami Middle School. She aspired to follow Uruka's path by earning a sports scholarship to Ichinose Academy, a goal she achieved. Her development involves balancing athletic ambitions with family responsibilities, though her brother-centric antics persist—such as seeking a princess carry, shortening her skirt for his attention, or suggesting communal baths. These comedic traits occasionally necessitate interventions from her younger siblings, who use hypnosis to alleviate her intense jealousy.

Mizuki maintains a polite but wary stance toward Nariyuki's female friends, particularly Fumino and Rizu, whom she initially disliked after their first home visit. Her admiration for Uruka remains unwavering, often leading her to accept Uruka's statements uncritically. Her relationships with her younger siblings are supportive, with Hazuki and Kazuki frequently assisting in managing her emotional outbursts.