Kokou no Ansatsusha wa, Oujo wo Hiroi Sodateru

Operating in the shadows, a solitary assassin dedicated to eliminating ruthless slave traders finds his solitary existence upended when he rescues a displaced former princess from the depths of captivity. Left with no easy path forward, he presents the young royal with a stark and unforgiving ultimatum: she can either accept her demise as a broken slave or embrace the arduous discipline required to learn the lethal arts of killing. As they navigate a treacherous world plagued by corruption and exploitation, their fateful encounter transforms into an unorthodox mentorship. Bound by survival and vengeance, the disgraced princess must shed her noble upbringing and forge a new identity in the dark. Together, the hardened executioner and his royal pupil walk a perilous road, where mastering the blade is the only way to reclaim their agency and settle old scores.