Okayu Seira

The older of the Okayu sisters.
She lacks self-confidence and is bad at expressing herself. When not in cosplay, she finds communicating with others difficult.

However, when with family members or someone who she feels she can let her guard down around, her motherly, caring nature is revealed.

What's more, she has a strong sex drive, and is a closet pervert. That plus her caring personality makes her desire to sexually service others quite powerful.

Cosplaying under the pseudonym "Aeto", she is well known for cosplaying male characters in tandem with her sister Riru. Although nobody knows her true appearance, her name is famous in cosplaying circles.

She is a firm believer in cosplaying the entire character, not just their appearance, and so takes great pains to mimic the personality of the characters she cosplays as.

She cosplays as the character "Sera" from the erotic, isekai, harem, fantasy manga the protagonist publishes, "Torotoro Evoking".