Soukou no Strain, licensed as Strain: Strategic Armored Infantry by FUNimation, is a mecha anime created by Studio Fantasia (Rumbling Hearts). The story is about a young cadet named Sara, who yearns to follow her brother Ralph to the stars, but in the midst of intergalactic war, betrayal intervenes to alter her fate. Sara loses everything when the enemy unleashes a surprise assault on her school, her friends and fellow cadets massacred along with her dreams. The leader of the enemy forces is no faceless villain... her brother commands the opposition. As the mystery of an ancient alien race surfaces and factions of humanity stand against one another, Sara changes her name and re-enlists. Her new mission: Confront Ralph to discover his true motives and, if necessary, put an end to his treasonous ways.