Looking for a manga where the MC acts & looks one way at work/school, but transforms into a totally different person away from his coworkers/costudents/family.

Just for example, let's say the manga was about a guy who is a stiff ornery nerd who wears glasses & dresses conservatively. But after school/work, he goes dancing at the club. He's wearing contacts, his long hair that he hides in a braid tucked into his shirt is lose, his unbottoned shirt reveals he has tattoos & wears a lot of jewelry, & he's a total party animal. He doesn't want his coworkers/costudents/family to know what he's really like behind the mask he wears, but someone finds out.

Or maybe she seems really sweet, goofy. & plays dumb, & is living as a student/businesswoman, but she's actually very conniving, manipulative, serious secret agent/villain/hero. (One example I can think of is Gokusen). Or still another example, an adult trapped in a child's body who pretends to be a dumb kid around certain people but is really someone to be reckoned with & not underestimated. (Probably like Detective Conan).

Does not need romance. Can be any genre (gag/comedy/4koma/parody, historical, action/adventure, crime drama, horror, sci-fi, etc) If it has any romance/sex at all, it has to be BL/yaoi.

Himouto! Umaru-chan Perfect imouto in public - Otaku slob in private

Fudatsuki no Kyoko-chan Stand offish and a bit cold in public - super emotional and girly vampire without her ribbon in private. Her brother is pretending to be an incestuous, lolicon delinquent to keep her secret.

Horimiya Both characters live very different lives at school vs at home.

Onii-chan Control Perfect innocent girl in public - incestuous manipulative yandere in private

His and Her Circumstances At least in the begining, the girl in school was different from the girl at home
Chiro Star Project maybe?

I mean she's pretending to be a guy and even her family doesn't know it.