Satoko dreams of marrying a noble but can’t escape the assassin who has her within his sights.

Afflicted with a heart condition, Meiji-era noblewoman Satoko is determined to secure a marriage that will benefit her family before she dies. But before she can realize her goal, she’s targeted by a mysterious assassin named Shinpei. In a last-ditch effort to save her life, Satoko asks her would-be murderer to marry her. Her proposal isn’t sincere, but unfortunately for her, Shinpei loves as intensely as he kills. Can Satoko find a way to break the engagement without losing her life?

Satoko’s new fiancé Mitsuharu Okumura urges her to marry him right away. She’s touched by his sincere feelings for her, and she knows saying yes would protect her family. Still, her heart aches for Shinpei. In the midst of her agony, her father suddenly appears with a surprise visitor.