Rio Mikazuki is a shinobi living in the modern world—a shinewbi, a contemporary ninja who relies on high-tech ninja tools and digital jutsu to fight crime and protect the night. Her partner and senior, Hajime Igarashi, belongs to the vanishing breed of old-school ninja who trained under harsh traditional methods and can perform genuine ninjutsu. Despite his formidable abilities, Igarashi steadfastly refuses to show his real ninja techniques to Rio, and his refusal hides an embarrassing secret. The two navigate their duties as modern-day ninjas while a lighthearted romantic tension builds between them, compounded by Rio’s secret crush on Igarashi and a series of misunderstandings involving their colleague Momo Shiranui. A key narrative arc takes them to Igarashi’s ancestral ninja village, where Rio unexpectedly finds herself competing in a bride trial that tests her skills and resolve. The story balances episodic missions with the slow development of their relationship, exploring the clash between high-tech and traditional ninja ways, and Rio’s growth from a rookie into a more capable shinewbi.