Onoyama Kotomi

Local idol. Eldest of the Onoyama sisters.

Unlike the twins with their strong personalities, her personality has a self-deprecating and self-undervaluing side. She has a strong sense of responsibility and can't ignore those in need. She's very caring and attentive. She's very good at enduring difficult situations and often struggles to voice what she really wants.

She became an idol after being scouted, accepting the role with the hope that she could make even one person feel better. Secretly, she hopes to eventually land a stable job, perhaps as an office worker.

She worries that her personality isn't as noticeable younger sisters', and that her breasts are smaller than Kotora's. As the story progresses, even Kokoto surpasses her and she starts to feel genuinely anxious, but she has a hard time expressing it.

She has a youthful face and is sometimes mistaken for being the same age as the twins, or even younger.