The cause of the broken engagement is... a mysterious shrine?! Together with my fiancé and her milk sister, I will appease the cause!

Recently, there's a global boom in broken engagements! One day, Val Viper suddenly receives news of a broken engagement from her milk sister, who is a close aide to the second prince she was betrothed to. While brushing off this announcement, her lord's betrothed tells her that the recent increase in broken engagements seems to be influenced by some kind of resentment. Meanwhile, the first prince of this country is also preparing to break his engagement. If he succeeds in breaking his engagement, chaos is inevitable. Will the three of them be able to appease the resentment and put an end to this country's broken engagement boom?!