During a time of war, a sword with mysterious power known as "Heaven's Sword" is stolen. The sword is said to bestow upon its wielder the ability to conquer the world. Various ninja from Dokutake Castle and beyond are also vying for this enormously powerful sword. Rantaro and his classmates are assigned their first real ninja mission: to recover the stolen sword.
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During a time of war, a sword with mysterious power known as "Heaven's Sword" is stolen. The sword is said to bestow upon its wielder the ability to conquer the world. Various ninja from Dokutake Castle and beyond are also vying for this enormously powerful sword. Rantaro and his classmates are assigned their first real ninja mission: to recover the stolen sword.
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