Aka Manto means red cape/cloak.
It's basically an evil spirit haunting the toilets. It will appear when you sit on the toilet and there is no paper.
It asks "do you want red paper or Blue paper?" (red cape/blue cape in some versions). If you take the red paper you will be cut into pieces.
If you take the blue paper you will be strangled.
According to some other versions if you choose the red paper your skin will be ripped off and if you choose blue paper all your blood will be drained out from your body.