Nocturne

I need help finding a manga(￣∇￣")
It's about a boy and his younger sister is very sick. This lady asks him if he is willing to risk his life for his sis and he says yes. He gets sent to the place and he turns into a girl. He has to fight 3 other girls in these games to get money and if u lose u die. All know is he names his girl form the same name as his sis and its "Yuki" Pls helpp~

Are there any gender benders i could read?
where a male turns into a female, even if he crossdresses its fine xD
I have read alot(shameful, but 12 )pages of gender benders already, and i cant find anymore ;-;

But if u also want gender benders, let me know :3 (But i only have male turning female genderbenders) (๑•ㅂ•)و✧