Six months have passed since Aini Mikkola, a country baron’s illegitimate child and a saintess-in-training, arrived at the Royal Academy. While the sons of noble families are charmed by her innocent and natural cuteness, many female students are outraged by her blatant disregard for aristocratic manners. Amid this turmoil, three young ladies find themselves labeled as the villainesses in reference to a popular story: Seraphina, the Crown Prince’s fiancée and an upright marquess’s daughter; Sandra, the proud daughter of a wealthy viscount family that made its fortune in commerce; and Bernardetta, the brilliant daughter of the current prime minister, also from a marquess family.

The story unfolds from the perspectives of these three young women as they confront the chaos caused by the saintess-in-training. Seraphina, who is betrothed to Crown Prince Erik, remains cool and composed, dismissing comparisons between herself and Aini. She shares a bond with the prince based not on romance but on their shared duty to protect the kingdom. Sandra deals with a fiancé who has fallen under Aini’s spell and openly disrespects her, while Bernardetta struggles in a home where her own brother has become one of Aini’s followers, leaving her with little place as the saintess’s reluctant guardian.

As an ominous atmosphere spreads through the academy, these three villainesses finally rise to correct Aini’s mistakes and follow their own hearts. The narrative is structured as an episodic record of their battles, with each arc focusing on a different character’s stand against the saintess and her followers. Volume one follows Seraphina as she confronts the situation directly, then Sandra as she decisively breaks her engagement and later receives a proposal from her ex-fiancé’s brother Gerald, and finally Bernardetta as she is awakened to her own worth by Seraphina and a foreign prince. Later volumes shift perspectives to the young noblemen, revealing the hidden truths behind the choices made by the unwavering villainesses. The setting is a royal academy where young nobles learn social graces before entering high society, and the central conflict revolves around the clash between genuine aristocratic dignity and the disruptive, rule-breaking behavior of the saintess-in-training. This is a record of the battle between three villainesses and a saintly apprentice, a struggle staking the women’s very ways of life on the outcome.