She's the homeroom teacher for Yumegaoka's first-year class 2 and supervises the Diving Club. What's notable is that she and Hikari share a genuine passion for scuba diving—they actually competed against each other when she first started at the school, which is how they discovered they were diving buddies. Fans have speculated that she might be the same character appearing in the manga iRoman Club, where someone with her exact name is Katori Senkou's older sister. Given that mangaka Amano Kozue is known for weaving blood relatives of main characters across stories, it's a real possibility.
She drives a Nissan Cube (a compact MPV) she's nicknamed "Pokoteng 3rd-kun."
Content compiled by AnimeList.moe from publicly available sources.
