Mizuki Yuiga (Yuiga Mizuki, 唯我水希 ) is the younger sister of Nariyuki and the elder sister of Hazuki and Kazuki.


As Nariyuki's younger sister, Mizuki shares a strong physical resemblance to him, having the same facial features as his (though hers are slightly more feminine). Mizuki's black hair is styled in a way that frames her face at the same time it is tied in a ponytail. Her breast is little bit large, much larger than Fumino.

During the week, Mizuki mostly wears a middle school uniform, while at home she wears an apron with printed words.


She has a serious brother complex, and mostly prepares housework for Nariyuki at home.

She dislikes Rizu and Fumino since they visited Yuiga's home at first time. However, she admires Uruka at swimming team.




  • She prepares lunch and dinner for family members.
  • She is good at housework.
  • Her aprons are printed in different English messages.
  • Her school uniform is same as Uruka at middle school, later revealed to be a student of Nanao Municipal Middle School.
  • She knows Kobayashi in childhood, and later Oomori.
  • She participates in swimming team, admires Uruka.



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