"All back" Hair for Sarah

I completed mission 30 on mission challange with no item reward, any ideas? Does it have to be dural or stage 8?

 

You have to do it in Arcade mode when it comes up randomly. They only appear of stages 4, 8 and dural though (hence the option on training mode) if it comes up and you fuck up or it doesn't come up at all then just lose the fight and try again since arcade doesn't show up on your win ratio or anything. You only get one chance against Dural though, but I think you always get a mission against her since I have every time I've faced her (could be wrong).

 

What up... can Sarah have black hair??!! please let me know because I would love it!