Serena lost her parents in a civil war and fled to the neighboring kingdom of Veena. She was taken in by an orphanage near the border, where she couldn't live a life of luxury but received enough food and clothing to survive, and she lived with gratitude.

One day, awakening to a sacred power, Serena came to live in a cathedral as a Saintess. It was decided that the First Prince's fiancée would be chosen from among the Saintesses, and Saintesses were summoned from five cathedrals, with Serena chosen from the Western Cathedral. She had casually assumed that a noble-born Saintess would naturally be selected, but due to a sudden oracle, "the Saintess with the strongest sacred power and a royal would become engaged," and Serena unexpectedly became the Prince's fiancée.

There's no way this engagement will work out, is there??

The story of an ordinary commoner Saintess, who was chosen as the Prince's fiancée.

All 10 episodes + 1 year later

Bonus added: A single story divided into two parts.