Any reference to the Red Cloak, a spirit from Japanese urban legend.

A masked spirit wearing a red cloak haunts public bathrooms, asking occupants of stalls a question. Typically, the Red Cloak reaches under the stall and asks if the occupant would like a red item or blue item (such as toilet paper). Choosing either option results in the occupant's death.

"Wikipedia article":[https://en.wikipedia.org/wiki/Aka_Manto]
aka manto