Io Yaginuma, formally named 夜木沼 伊緒, serves in the combat unit Altair Torte. Born December 28th under Capricorn with blood type O, she stands at 167.2 cm, her figure measured at 90/60/89 cm. Renowned for her calm, composed demeanor, she embodies an older sister role within her team, fostering camaraderie and earning widespread admiration.

A prodigy in athletics, she dominates nearly every sport, her prowess enhancing mission performance through agility and strength. Her capabilities are quantified by peak scores in intelligence and physical fitness, balanced by moderate sociability and lower marks in sensibility and endurance. The symbolism of her name mirrors her essence: “Io” blends “that one” and “thread,” suggesting individuality and connectivity, while “Yaginuma” weaves “night,” “tree,” and “swamp,” evoking mystique and resilience.

Her leadership shines in collaborative efforts, such as initiating volleyball drills to sharpen team coordination. Strategic acumen defines her rivalry with Procyon Pudding’s Amane Kyoubashi, her sharp observational skills dissecting opponents’ tactics. Since her debut, she has consistently secured top placements in in-game popularity polls, cementing her status as a fan-favorite character.