Isumi Sakishima, third-year setter and Nohebi Academy’s jersey number 7, sports short blond hair tinged with reddish-brown hues, dark blue hooded eyes, and faint freckles. His 1.74-meter frame, though slightly above average height, positions him among the team’s shorter members. A calculated provocateur, he exudes overconfidence, collaborating with Suguru Daishou to taunt rivals and disrupt their focus. Beneath this antagonism lies steadfast loyalty to his third-year peers, blending sly jabs with genuine camaraderie during matches. In the Spring High Preliminary against Nekoma, his psychological tactics target Lev Haiba’s blocking errors and opponents’ nerves, though skilled blockers like Kuroo Tetsurou visibly rattle his composure. His adaptable setting technique occasionally falters under defensive pressure, exemplified when Lev intercepts his setter dump. Moderately ranked in power, speed, and game sense, he compensates with above-average stamina and technical precision. Post-loss, tearful yet affectionate exchanges with teammates reveal his emotional depth and shared resolve to reach nationals. Trusted by captain Kazuma Numai in pivotal moments, Isumi embodies Nohebi’s fusion of cunning strategy and tight-knit solidarity. His name derives from the Sakishima habu snake, aligning with the team’s serpent-themed identity. As a secondary antagonist in the Nekoma clash, his narrative role contrasts psychological warfare with athletic prowess, underscoring volleyball’s multifaceted competitive dynamics.