 If you liked
Himegoto: Juukyuusai no Seifuku
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 ...then you might like
Shishunki Bitter Change
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If the characters from Shishunki Bitter Change had lots and lots of sex, and only got more miserable because of it, they'd sooner or later show up in Himegoto. Himegoto has turned really dark lately, but the basic premise in both these mangas are people with insecure gender (and what's else) identities who's trying to sort stuff out.