猫屋敷 寝子

Protagonist's younger sister. A third-year student at the academy.

She has a cheerful, friendly personality, but she can also be fickle like a cat. Because of her short stature and childlike face, she's very rarely seen as a senpai, which frustrates her.

Even though she's still a student, she's also a genius pharmaceutical researcher. To save her older brother, who was hovering between life and death due to overwork, she administered an immortality drug that she developed herself, causing him to turn young again as a side effect.

She ends up joining the film club's activities. She helps fill in during filming when the club is short-handed.