Underdog Upsets the King

The story centers on Mikado Watanabe, an introverted high school student who maintains a double identity online as the so-called "King of Self-Destruction," a high level online shogi player who makes even pro players shudder. Mikado joins his high school's shogi club after a series of strange events, enter the amateur shogi tournament Kouryuusen, and begins his rise in the game outside of the Internet, alongside his fellow club members.

(Source: Anime News Network)