A loyal shinobi willing to die for her cause. A ruthless spy who must never be caught. Their fates collide in a contract marriage—where betrayal lurks behind every vow. Ito, the last descendant of a shinobi clan, is forced to marry the infamous military officer, Tōdōen Yūshin, as collateral for her lord’s overwhelming debt. Though her identity is quickly exposed, Yūshin makes an unexpected proposal: assist in espionage operations for the military, or suffer the consequences. "Can you throw away your life for me?" In a dangerous world of deception, strategy, and shifting loyalties, a shinobi and a spy must navigate their precarious bond—where love, duty, and survival intertwine.