Amakusa Rin, fearsome daughter of the Blue Dragon faction leader, and Horii Shinsuke, soft-spoken fighter of the Shirai faction, find themselves in a strange situation. To consolidate power between their factions they have to… get married?! With Rin hell-bent on avenging her mother’s death and Shin determined to marry only for love, their union is doomed from the start. After negotiating an engagement period, Rin and Shin must find a way to annul their marriage without instigating all out war between their factions. Can they succeed before their wedding night… or before they catch feelings?