"Sakura Taisen: Ecole de Paris" is a two-episode OVA series set in the "Sakura Taisen" universe, focusing on the Paris-based Flower Division of the Imperial Assault Force. The story takes place in an alternate 1920s Paris, where the city is protected by a group of young women who pilot steam-powered mechs known as "Koubu" to combat demonic threats. The Paris Flower Division, led by Glycine Bleumer, includes members such as Lobelia Carlini, Hanabi Kitaoji, Coquelicot, and Iris Chateaubriand. Each member brings unique skills and personalities to the team, contributing to their dynamic as both performers at the Grand Palais theater and defenders of the city.

The narrative begins with the arrival of Hanabi Kitaoji, a Japanese exchange student and former member of the Tokyo Flower Division, who joins the Paris team to strengthen their ranks. Her integration into the group is met with initial resistance, particularly from the fiery and competitive Lobelia, but over time, the team learns to work together. The central conflict arises when a mysterious enemy, the Black Sanctum Council, begins targeting Paris with demonic attacks. The Paris Flower Division must uncover the council's motives and stop their plans, which involve harnessing dark energy to unleash chaos.

Throughout the series, the team faces various challenges, both in combat and in their personal relationships. Glycine struggles with her leadership role, while Lobelia grapples with her past and her rivalry with Hanabi. Coquelicot, the youngest member, provides comic relief but also demonstrates her determination to prove herself. Iris, the team's cheerful and optimistic member, serves as a unifying force. The OVA explores themes of teamwork, trust, and the balance between duty and personal growth.

The climax involves a high-stakes battle against the Black Sanctum Council, where the Paris Flower Division must combine their strengths to overcome a powerful demonic entity. The resolution highlights their growth as a team and their commitment to protecting Paris. The series serves as a standalone story within the "Sakura Taisen" franchise, offering a glimpse into the lives and struggles of the Paris Flower Division while maintaining ties to the broader universe.