A viral video, asking the question "Do you know mayonaka TV?", is going all, well, viral. The clip is apparently a teaser for an upcoming anime based on forthcoming role-playing game Persona 4.
"Mayonaka terebi" is "midnight TV", but in the game series, it's a fictional television broadcaster.
The clip shows Tokyo's JR Yamanote Line and asks if viewers know "mayonaka terebi". There is a countdown site for Mayonaka-TV.jp that ends in around seven hours. However, if the site is viewed on Japan's Docomo mobile phone network, it clearly says PERSONA4ｱﾆﾒｰｼｮﾝ or "Persona 4 animation".