The heroine of this story is an average student and a member of her school's archer club. In a sudden twist of fate, she finds herself leaving her uneventful life behind, being thrown headlong through time to medieval Japan. In this time, knowns as the "Warring States" period, continued civil war ravages with no end in sight. She appears in this time right at the feet of Masatora Uesugi, later known as Kenshin Uesugi. Masatora takes an interest in her bizarre clothes and way of talking, brings her back to Kasugayama Castle and places her under guard of the "Nokizaru", a unit of ninjas. Although life in this war-torn era is not something she has ever expected up until now, she does her best to stay positive. She finds a place for herself by connecting with the people around her, eventually understanding and feeling the importance of the bond with them.
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