Torigoe Chigusa

She left her parents' home for Tokyo at a young age.

She is a married woman, but is a fun loving at heart, so there are always rumors of her being unfaithful. She often comes to Nanako's house without hesitation.

She has a flamboyant personality (and looks), and is a bit of a rascal in many ways. She takes advantage of her husband's meekness and continues to play around wildly even after marriage.

She lacks a sense of guilt about her sexuality and is often tempting Issei. At the core, however, she is an experienced adult and a reliable person.

She watches the relationship between Issei, Nanako, and Yuka from a distance. She is interested in the young and inexperienced Issei.