Yuuya Kanzaki  

, 神前 夕哉

Mitsuki's stepbrother, despite having just met her stepsister, has shown care and concern for her wellbeing. As a male main character in the series, he stands out as the only one who hasn't engaged in any sexual activity or made lewd advances. However, an unfortunate incident occurred when his step-sister accidentally saw him naked while opening the bathroom door from outside. Despite this, he is considered the most rational of the three main characters in the show.