Jantei: Battle Cos-Player

Jantei: Battle Cos-Player is a 4-way riichi mahjong game featuring a science-fiction story and a combination of live-action and animated opponents. Set in a futuristic city where the greatest treasures are the costumes of a previous era, the player and their partner Yuko Saionji challenge a series of opponents to mahjong matches in order to collect as many costumes as possible and become the "Jantei", or Mahjong Emperor. Defeating opponents will award their costume, which Yuko can wear and show off in animated or live-action videos depending on which type of costume it is.

In addition to the main story mode, there is also a free battle mode. There is also a "making-of" disc included in the package, which contains a photo gallery and cast interview videos.