|Name (Japanese)||仲井純平（なかい じゅんぺい）|
|Name (Romaji)||Nakai Junpei|
Nakai (仲井純平) plays mahjong for a living. He meets Osamu in a mahjong parlour and denies the rumors about Akagi to true. Playing in a game with Akagi, he cheats with the use of signals, but is still defeated. He does not appear in the anime.