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Ryuka, a young ninja from the secretive Hyakuchi clan hidden in modern Japan’s mountains, receives his first mission to protect Tsubaki Tenma, a cheerful high school girl. Unfamiliar with the outside world, Ryuka struggles to adapt to Tsubaki’s carefree personality and urban life. Tsubaki, unaware of the dangers surrounding her, treats Ryuka as a friend, creating tension with his serious demeanor. Their dynamic shifts as Ryuka encounters suspicious figures, like a mysterious woman during a school trip, hinting at threats tied to Tsubaki’s family. The pair’s evolving bond blends humor and challenges as Ryuka balances his duty with growing affection.