The title "AKAGI" comes from the name of the main character. He is a young boy who is a very talented gambler and makes remarkable wins in the story. In the first story he starts to play mah-jong against Japanese mafia (Yakuza) for the first time in his life but quickly he understands how the game goes and win. Mah-Jong is a game that involves huge amounts of money and Japanese Yakuza uses it to earn money. So when Akagi first won, it was his first step in to the underground business. Akagi shows incredible talent throughout the story, but he also is a heretic that makes him different from others. In the end he becomes a legend in the underground world.

The manga series first started in 1993. It is still running in "Weekly Mah-Jong" in Japan, and it's even been adapted into a movie.

Source: MOON PHASE, source for summary: Wiki.

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