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In a nation protected by elite ninja academies, strength, speed, and skill are the only paths to becoming a guardian. Rin Kazuma is an ordinary boy with no special talent, yet he dreams of entering the most prestigious academy in the country alongside his friends Daichi and Akira. As mysterious incidents begin to occur beneath the academy, hidden secrets from the past start to surface. An ancient system known as Project Zero awakens, revealing a truth buried long before the academy was built.