Masamune Gotō is a 9-dan professional shogi player in his 40s, physically fit with grey hair and piercing purple eyes. His imposing, often intimidating appearance contributes to a cold atmosphere within Shogi Halls. Gotō possesses an abrasive and unpleasant personality, routinely creating tension in professional settings. His behavior includes acts of physical aggression, notably striking Rei Kiriyama in the face during a confrontation stemming from an agreement concerning Rei's relationship with Kyouko Kouda, Rei's stepsister.

Gotō is married to Misako, who resides comatose in a Tokyo hospital; he visits her periodically, bringing care products. His relationship with Kyouko Kouda is toxic and mutually destructive. Kyouko seeks validation from older men due to paternal issues, while Gotō appears to use their connection for companionship amidst his wife's condition. They engage in frequent, volatile arguments, often ending with Gotō departing and Kyouko distraught. Though Gotō publicly labels Kyouko's actions as "stalking," he privately perpetuates their dynamic. He gave her a wristwatch, signifying ongoing involvement.

Gotō's interactions with Rei Kiriyama remain primarily adversarial, especially regarding Rei's bonds with the Kawamoto family. He insinuates Rei will ruin the Kawamotos, mirroring Rei's past with the Kōda family, thereby exacerbating Rei's emotional conflicts.