In ancient times, a curse was placed on the Rindo family. The curse stated that they could only give birth to females. To temporarily lift this curse, they needed to have a child with someone from the Hizuki family. After the curse was lifted, it would return every third generation. Currently, Naoto Rindo is facing this unfortunate fate. His ex-fiancé, Suzune Hizuki, passed away in a tragic accident. As a result, he must now impregnate one of the other four girls from the Hizuki family. However, time is running out and there are still many unanswered questions about what exactly happened to Suzune and how the curse will manifest in the future since she is still alive.