
But knowing my luck it wont end up that way.

Mizuki's gender is female, so...

Sorry, I would complete the reply I initiated.
It contains SPOILERS.
"Mizuki's gender is female, so" Mizuki will stay as a girl.
Mizuki was born as a boy, but as we could read and discover in the whole manga, since a little kid, Mizuki had been a female.
Yeah Mizuki also behaved as a guy, but being like a girl/guy based on stereotypes, doesn't make a gender or a sex.
I'm an ignorant about a lot of stuff and I think Mizuki's gender issues might have been treated shallowly (for comedy purposes), but Mizuki is happy at the end being what Mizuki wanted to be (Mizuki's choice).

No.
It's called 'nonbinary'. They shift from female to male.
Mizuki started as a male, turned into a female, then became both which is nonbinary.

Eh thats more like gender-fluid or bigender, as nonbinary does not fit the male and female binary (I'm aware that they can identify as the other two as well BUT I don't think Mizuki is nb ╮( ̄▽ ̄)╭ )
10/10 great story development I love how the author really took his time to really develop these characters. And these plot twist omg i legit had my whole day planned ahead of me. and this manga would not let me go i swear everything about this manga was so well done to me