The story is set in the year Showa 44 (1969), and it centers around Takanori Jinguuji, the 27-year-old man who eventually become the head of the Japan Shogi Association in the main 3-gatsu no Lion series.

Rei Kiriyama is a child prodigy. Rei Kiriyama is also an orphan who lives alone in an empty apartment. Rei Kiriyama is a teen working in an adult's world. Life is complicated for Rei. He's an up-and-coming shogi player on the verge of turning pro, but he has no homelife, or much of a life period,outside his board game, but thankfully with the help of some life-long friends he has an opportunity start all over again.
 
(Source: DENPA)
 
Notes: 
- Winner of the Grand Prize at the 4th Manga Taishou Award in 2011. 
- Winner of the 35th Kodansha Manga Award in 2011. 
- Winner of the Grand Prize at the Tezuka Osamu Cultural Prize in 2014. 
- Winner of the Grand Prize at the Japan Media Arts Festival in 2021.

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