I think Kyo uses 304 as a code. 3 is half of 6, the western number of the devil. 4 is associated with death in Japan since the other way you could pronounce 4 is "san" which also means death. That's why they skip room 4 a lot in hospital buildings.
I think Kyo uses 304 as a code. 3 is half of 6, the western number of the devil. 4 is associated with death in Japan since the other way you could pronounce 4 is "san" which also means death. That's why they skip room 4 a lot in hospital buildings.