Hideri does seem to genuinely identify as female and even shows signs of gender dysphoria at one point (running towards the women’s restroom, covering her chest with a towel at the hot springs). She even says that she’s a girl on her resume, so why is she still treated as male by everyone else?
Because legally, Hideri is male. Unless he transitioned, he always will be.
He's pretty clearly supposed to be a male crossdresser, not a trans girl. Unlike the other waitresses, he's just constantly "in-character", even on his resume.
In the manga, it's stated that one of Mafuyu's relationships ended abruptly when her date was arrested on pedophilia charges. What was stopping her from showing an ID to prove she was legal? Did she try but get ignored? Are the police that triggerhappy that they'll arrest anyone for any excuse? Is Naru in charge of the local precinct and uses the police as her own personal army to oppress anyone she views as a pervert?
Why does no one acknowledge that Dino is trying to hook up with someone who is ten years younger than him? Everyone else is actively trying to pair him and Maika off, and the only time the age gap is mentioned is Played for Laughs.
It's likely due to Values Dissonance. In Japan, people don't make as much of a big deal about Age Gap Romances, especially fictional ones.
