Riichi City × Kakegurui xx Collaboration Event Runs October 22 to November 20

Published: October 22, 2026
Riichi City × Kakegurui xx Collaboration Event Runs October 22 to November 20

A collaboration event between the online mahjong game Riichi City (麻雀一番街) and the TV anime Kakegurui xx starts on October 22.

Four characters from the anime join Riichi City as collaboration characters: Yumeko Jabami, Mary Saotome, Kirari Momobami, and Ririka Momobami. The collaboration runs from October 22 to November 20.

Riichi City is a competitive online mahjong game developed and published by Formirai Co., Ltd. Its signature feature is that players compete in mahjong matches using a character of their own choosing.

Kakegurui xx, this time's collaboration partner, is an anime set at a prestigious school where social rank is decided by gambling. An election campaign to become student council president begins, and protagonist Yumeko Jabami and the Momobami clan face off in extreme games.

The newly recorded in-game voices are provided by the same voice actors as the anime: Saori Hayami, Minami Tanaka, and Miyuki Sawashiro.

Each character can be obtained by drawing them through limited recruitment and then used in matches. Awakening a character lets players switch to a "Dress" outfit.

A limited-time collaboration outfit, "Bunny Girl," will also be on sale. Collaboration-exclusive items debut as well, including riichi sticks, mahjong table backgrounds, titles, and winning-hand effects.

Each character comes with many unique voice lines. Players can enjoy a variety of character reactions and special effects when winning a hand, winning by self-draw (tsumo), scoring a yakuman, and more.

Multiple events celebrating the collaboration are also planned. Simply logging in earns 3 Mahjong Vouchers for free.

Check the official X account for the latest information. Additional limited-time events, updates, and collaboration announcements are planned to be revealed one after another.

The Riichi City × Kakegurui xx collaboration is a limited-time event running from October 22 to November 20.

About Riichi City

Riichi City is a free-to-play, moe-style mahjong game that can be enjoyed in full at no cost. Players can be matched against mahjong enthusiasts from around the world, and a variety of match modes let everyone from beginners to advanced players enjoy authentic mahjong. Players can also raise a distinctive cast of characters voiced by a notable lineup of voice actors, including Satomi Arai, Yui Ishikawa, Maaya Uchida, Saori Onishi, Yui Ogura, Noriaki Sugiyama, Daisuke Namikawa, Hina Suguta, Manami Numakura, Rena Hasegawa, Shuta Morishima, Aoi Yuki, and Yukana. Players can join matches with animated character portraits, cute character stamps, and customizable table backgrounds, mahjong tiles, and riichi sticks to raise their own dedicated mahjong player.

Download the Game

App Store: https://www.mahjong-jp.com/ad/c133

Google Play: https://www.mahjong-jp.com/ad/c133

Official SNS

Official Website: https://www.mahjong-jp.com/ad/c133

Official X (formerly Twitter): https://x.com/RiichiCity_JP

Official Discord: https://discord.com/invite/5z3Nw2rPNx

Game Features

Free to play: Authentic mahjong can be enjoyed at no cost. Chi! Pon! Kan! Pinfu! Chinitsu! Kokushi Musou! Try building the hands you like with ease.

Packed with realistic touches: The modern "Riichi Mahjong City" is filled with realistic elements such as mahjong tournaments, shops, and day-and-night changes. Smooth matches still deliver the tension of a real game.

A cast of mahjong players with distinct styles: Meet characters with a variety of playstyles, including offensive, defensive, and hand-reading specialists, and aim to become a pro mahjong player through exciting matches. Characters are easy to raise, and awakening a character unlocks further costume changes.

Popular voice actors: Characters brought to life by popular voice actors gather in the game. Become their captain and aim for "number one in the land" together. The cast, in Japanese alphabetical order, is Satomi Arai, Yui Ishikawa, Maaya Uchida, Saori Onishi, Yui Ogura, Noriaki Sugiyama, Daisuke Namikawa, Hina Suguta, Manami Numakura, Rena Hasegawa, Shuta Morishima, Aoi Yuki, and Yukana.

Recommended for

  • People looking for a free-to-play app for casual mahjong
  • Anyone who wants to enjoy mahjong casually, from beginners to advanced players
  • People who want to play an authentic mahjong game
  • People who want to learn the rules of mahjong
  • People who love mahjong and want to play online as well
  • People looking for a mahjong game with a thorough tutorial
  • People who want to play mahjong to pass the time
  • People who want to play against friends or strangers online with ease
  • People who want to enjoy mahjong at home or on the go
  • People who like strategic games such as mahjong
  • People who like mahjong but find going to a mahjong parlor intimidating
  • People interested in mahjong who want to get excited about online matches
  • Mahjong fans who want to sharpen their skills against other players
  • People who love mahjong and are looking for opponents
  • Fans of Donjara games
  • People who want to test their mahjong skills in online matches

The information above is current as of the announcement date. Please refer to the content as implemented in the game for final details.

©Formirai Co.,Ltd.
©Homura Kawamoto, Toru Naomura / SQUARE ENIX, "Kakegurui xx" Production Committee