Yuuka Hayase

Yuuka Hayase is the pragmatic and highly capable treasurer of Seminar, the powerful student council governing the STEM-focused Millennium Science School. Revered as a mathematical prodigy who solves complex equations mentally and calculates trajectories mid-combat, she earned the fearsome nickname "Cruel Arithmetician" because she relentlessly slashes the budgets of extracurricular clubs, maintaining a particularly hilarious, long-standing feud with the financially reckless Game Development Department. Despite her strict, logic-driven demeanor and her habit of carrying an abacus to calm her nerves, Yuuka possesses a deeply caring, deeply endearing "tsundere" personality that shines through in her interactions with Sensei; she constantly nags them about their abysmal spending habits and impulse purchases while quietly managing their office finances, making her one of the most reliable and fiercely protective anchors of Schale. On the battlefield, she acts as a front-line Striker and Tank who relies on heavy cover and defensive barrier calculations to absorb damage, utilizing her signature dual submachine guns, poetically named Logic and Reason, to shred oncoming enemies. Her immense popularity within the community—fueled by her prominent role as the game's initial tutorial companion—skyrocketed even further with the release of her highly sought-after "Gym" variant (Yuuka Trackfield), which transformed her from a standard cover-tank into a top-tier meta unit capable of repositioning her entire squad with shield-deploying water bottles during the Kivotos Halo Games event. Between her iconic navy-blue twintails, her sharp Seminar uniform, her massive presence in official merchandise like scale figures, and her heartwarming bond with Sensei, she also weighs 100kg