Seinarukana tells the tale of Nozomu, a normal high school student troubled by a recurring nightmare lately, and his friends. While they were preparing for the upcoming festival, their school gets attacked by strangely dressed girls equipped with swords and spears. After the ensuing chaos they find themselves in an another world - the whole school, including the building itself. This story is about how their search for a way home takes impossible turns that would carry them through many worlds, conflicts and even wars.
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