The protagonist’s stepsister, who came into his life when Junko remarried.
Unlike the protagonist, who is a repeat exam taker, she was accepted into a top-tier private university on her first try, so she always looks down on him and makes snide remarks.
Far from warming up to Junko, her new stepmother, she views her as the woman who took her father away and treats her with hostility though in front of her father, she puts on a friendly facade and never lets on about her true feelings.
At the university where her father is an alumnus, she’s constantly fawned over thanks to her striking looks and outstanding figure.
She’s a member of the golf club at university, another influence from her golf-loving father.
She has an extreme father complex and harbors incestuous desires. Her fantasy during masturbation always involves having sex with her father whom she calls “Papa.”
[From
archived official site]