In the kingdom of Rienlein, it is custom to appoint a woman with memories of another world as a Saint and make her Queen. Following this tradition, Iris—who retains knowledge as a history-loving “reki-jo” from her past life—was chosen to be Queen. However, hers was a political marriage, and she was forced to live a cold, loveless life, never feeling the affection of King Reinhardt. Things only worsened when a new Saint, Hina, arrived from another world—Reinhardt’s heart clearly shifting toward her. One day, Iris learns that the King has spent the night with Hina. That’s when she finally makes her decision: “I’m leaving this place!” What awaits in the tangled fate of a clumsy-in-love Queen and a tsundere King, as their misunderstandings continue to build?