Akagami-Aogami

赤紙青紙, Red Paper Blue Paper
Translated as quotRed Paper Blue Paperquot AkagamiAogami haunts the restrooms asking to his victims if they want red paper or blue paper. Both options are terrible ways of death with quotredquot meaning the victim getting his blood drained out and quotbluequot meaning suffocation until the victim becomes blue due to asphyxiation. Answering with another color doesn039t stop him either as Hajime does so in this case he answered quotyellow paperquot and is almost dragged to the underworld. Satsuki seals AkagamiAogami through a jar filled with water and marked with the symbol of a Torii. He appears in the 2nd episode and reappears in the 20th episode. Source: Wikipedia