Akari
Asahi's homeroom teacher and someone who's fully aware of basically every ridiculous secret the class is hiding—though she's usually too busy dealing with her own devilish ancestor to care much. She's also pretty much the only adult who can actually make Akane face consequences when her pranks cross the line.
She's best known for being aggressively single. Like, legendarily single. She went to a hundred marriage interviews and still struck out, earning herself the nickname "Akari of the Hundred Visits." It's become such a defining part of her existence that it somehow drains Shiho's sex appeal just by proximity. When she thought Shirou was flirting with her once, she got all flustered before he casually told her she was too old for him and he just admired her as a teacher. Ouch. These days she's holding out for a prince on a white horse—and she means that literally.
For someone constantly lamenting her love life, she's got surprisingly little self-awareness. She's your typical hard-drinking party girl who'll buy a brand new car one day and then let Akane drive it while she's passed out from beer, leading to exactly what you'd expect. She also used to be a delinquent back in the day and definitely doesn't want people knowing about her wild past—though rumors of her legendary exploits still circulate.
What makes her work as a teacher is that she genuinely understands what Asahi's dealing with and tries to be the voice of reason, even if she's not exactly succeeding. She can flip between formal and crude in the same conversation, and she's got that same creepy grin as Akane when she's about to cause trouble. She's no better than the chaos around her, really—just trying her best.
Content compiled by AnimeList.moe from publicly available sources.