Issa Matsumoto, a 26-year-old professional shogi player ranked 5-dan, hails from rural Japan and stands at 181 centimeters with an exuberant demeanor marked by passionate outbursts and occasional brashness. His volcanic playing style prioritizes relentless offensive maneuvers, earning the "Attack! Attack! Attack!" epithet from colleague Rei Kiriyama. While fostering boisterous camaraderie within shogi circles through lively exchanges with peers like Smith, Matsumoto directs particular affection toward Rei—though his zeal sometimes strains their dynamic. Beyond the board, he frequents a local bar staffed by admired acquaintance Akari Kawamoto, yet maintains disciplined focus on competitive matches over extended social pursuits.