The storyline of the Assault Lily doll series anime revolves around a world that is in danger of being destroyed by enormous, unknown creatures known as "Huge." In response to this threat, mankind comes together to meld science and magic, resulting in the creation of "CHARM" - Counter Huge Arms - a weapon designed to fight back against these colossal beings. Adolescent girls display remarkable synchronization with CHARM and are dubbed "Lilies," recognized as heroic figures. Across the globe, "Garden" military institutions are established to train Lilies to protect humanity from the looming threat of the Huge. The series tracks a cohort of brave young women who aspire to become Lilies and enrol in one of the Garden academies to join the fight.