TV-Series
Description
Kai Shimada is a professional shogi player who serves as a significant supporting character in the story. He is in his mid-thirties, which places him in the same generation as the current master, Toji Soya, but his thin build and receding hairline frequently cause others to mistake him for being considerably older. Standing at 180 centimeters tall, his lanky frame and mature appearance are a running point of contrast with his actual age.

Shimada is widely recognized as the personification of effort and perseverance within the shogi world. He is a calm, patient, and remarkably kind individual who genuinely cares for the well-being of his peers and younger colleagues. Despite his gentle demeanor off the board, he becomes intensely focused and competitive during matches. He is also prone to self-reflection and worry, often questioning his own decisions and the impact they have on those around him, particularly when members of his study group must face each other in tournament play.

His core motivation is deeply rooted in his origin. Shimada was born and raised in a small, depopulating mountain village near Tendo in Yamagata Prefecture. As a child, he learned shogi from the village elders and, being hailed as a local prodigy, was supported by the community to travel to Tokyo for matches. This support created a powerful sense of duty; he carries the hopes of his hometown on his shoulders. His ultimate goal is to win a major title to make the people who supported him proud, and he fights not just for personal glory but to honor the banner of encouragement that still hangs in his hometown's train station. He has made significant sacrifices for this dream, most notably ending a relationship with a woman he loved from his hometown, a choice he refers to as the price of dedicating his life to shogi.

In the story, Shimada fulfills the crucial roles of a rival and a mentor. After defeating the protagonist, Rei Kiriyama, in a tournament, he invites Rei to join his shogi study group, providing him with a vital community of peers and a structured environment for growth. He is an A-class, 8th-dan player, one of the highest rankings in professional shogi, and is known for his solid and aggressive "static rook" strategy. His most important relationship is with Harunobu Nikaido, another young shogi player who looks up to him like an older brother, calling him "Big Brother" while Shimada affectionately refers to Nikaido as "Kid".

Shimada's personal struggles add a layer of realism to his character. He has suffered from chronic stomach pain since his days in the apprentice league, which intensifies during high-pressure matches. He is also a notorious "rain man," as a significant majority of events and matches he participates in are affected by rain, a trait tied to his childhood when he was asked to pray for rain at a mountain shrine. Throughout the narrative, Shimada develops from a figure of quiet, unyielding effort into someone who also learns to find joy in the connections he makes through shogi. Although he has faced defeats in title matches for both the Lion King and the Master of Kishi titles, his persistence never wavers, earning him the deep respect of Rei, Nikaido, and the entire shogi community.
Cast