Japan has entered a new era called "Reiwa", after moving past the Heisei Era on April 30th 2019.
 
It is in this era, past the time of people like the legendary Akagi Shigeru and others like him who gambled on mahjong for a living, that a new gambler has arisen known only as "Mamiya of Mahjong's Darkness".
 
(Source: Original publisher, edited)
 
Note: The chapter counts contains "Chapter 0".

Takashi Ten is living his life as a rep mahjong player. A kind person at heart, he also possesses an ingenious talent in mahjong. One day Ten meets Hiroyuki Igawa, a student player who 'plays by logic'. Hiroyuki is overwhelmed at Ten's playing style which involves anything besides logic, and soon becomes one of his close friends. 
Being the rep player he is, Ten had to play against some Yakuza. The chance of victory seemed to be on Ten's side, but then the yakuza decide to call their secret weapon, a legendary rep player called...

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