On the day of my university entrance exams, I was raped by a bald man...

Kotomi, an exam student aiming to go to university, moves to Tokyo to take the exam and ends up at the house of her older sister, Masami. Kotomi is a shy guy who is a little shy about his brother-in-law Kohei, who has begun living with him, and his father, Daikichi. Who is the naughty gaze that is directed at her?