Sena Izumi is a transfer student at Koua Academy, an elite institution training Japan's future leaders. Maintaining the appearance of an ordinary freshman, he conceals his true role as a covert assassin within The Weiss. Alongside fellow members Ken, Yoji, Omi, and new recruits, Sena undertakes a mission to dismantle the academy's entrenched corruption. This systemic evil sees influential students and teachers stage "suicides" to purge those deemed unworthy. Sena and The Weiss operate within the academy to eliminate this deadly tradition.