In the universe of Loveless, individuals are born with distinctive cat ears and tails, symbols of their purity that vanish upon losing their virginity. Combat revolves around pairs: the Sacrifice endures harm while the Fighter launches attacks. Enter Ritsuka Aoyagi, a 12-year-old grappling with amnesia and the recent loss of his brother. His world shifts when Agatsuma Soubi, claiming ties to his late sibling, appears and reveals their past as a fighting duo. Bound by fate, Ritsuka and Agatsuma unravel the mystery shrouding his brother's demise and the enigmatic 'Seven Moons' organization. Amidst their quest, an unexpected closeness blossoms between them, blurring lines and deepening their connection.