Post an anime that boy turned into girl or girl turned into a boy

Yuki from Uraboku was reborned into a girl.

Lucy & Gray..(Fairy tail)

Natsu read some magic code then every one near that spell switched bodies..........here gray & lucy switched bodies..............
now gray is in lucy's body he have a habit of stripping his shirt.........he was going to strip his sando while he is in lucy's body..& lucy in gray's body is stopping him......its a bit funny scene........he he hehe

Keiichi from underwent a remarkable fail of a magical gender bend in an episode of Ah! My Goddess. He only got about half way there.

Ok I haven't actually seen Un-Go (I want to lol I just haven't gotten around to it yet)
but I'm pretty sure he can turn into a woman.

Yuuki RIto from To Love-ru turned into a girl several times

The angel Angela can turn into her male counterpart Ash and vice versa in Kuroshitsuji.

Ranma from Ranma 1/2 changes into a girl whenever he comes into contact with water (if my memory serves me right)

The anime club

boy to girl