I'm a saint's older sister, but for some reason I decided to serve the fascinating duke (volume 1-3)

Publisher: Kodansha
Author: Ayasu Mai, Hachimi☆Wan, Ichinoya Suzu
Size: 128mm x 182mm
Number of books: 3
Language: Japanese
Category: Girl manga, manga
Latest release date: 2023-11-30

Synopsis:
The condition to serve the duke is "do not fall in love." It is the only way to do it for a happy day.

The life of the poor Baron's daughter, Floria, has changed significantly by the oracle.
Renata, who should have been shy, was chosen as a saint, and his attitude changed suddenly, and for some reason, he began to turn Floria as an enemy.
In order to escape from Lenata, Floria, who had been served as a servant in the aristocratic mansion, met the most beautiful Duke, Digire.
With the encounter with him, the daily life of Floria changes further dramatically and vividly.