「Ｊ９って知ってるかい？」「不知火です」
http://www.nicovideo.jp/watch/sm24423553

"Do you know J9?"
"It's Shiranui."

http://www.nicovideo.jp/watch/sm24423553
"Do you know J9?" is a quote from the opening of Ginga Reppuu Baxingar.