At the prestigious Myoujou Academy, newcomer Tokaku Azuma joins a unique class where she and 11 classmates are deadly assassins. Their mission: eliminate the innocent Haru Ichinose to fulfill their deepest desires. Bound by one shot to succeed, failure means expulsion. Despite the ruthless challenge, Tokaku's heart shifts as she grows attached to her target. Determined to defy the deadly game's rules, Tokaku safeguards Haru from the class's murderous intentions, choosing friendship over bloodshed.