A Princess Struggling to Break Free of the Rope

A princess from a certain country was taken away by a demon king. The princess's stepfather, the king, was furious and launched a country-wide rescue mission. He gathered the best soldiers from all over the country and sent them to the Demon King. Among the soldiers was the princess' lover. Secret lover. The two fall in love, but the man is a soldier who used to be a farmer. The king was adamantly against the relationship. At this point, he has no choice but to rescue the princess himself and use the results to gain her consent to marry him. That thought fueled hes fighting spirit. Meanwhile, the princess was tied up and held captive in a small room in the Demon King's castle. She is a bit of a strong-willed princess and makes a fuss even when she is tied up, so the Demon King gets a little tired of it and has her gagged. Still, the competitive princess somehow thought of escaping on her own.