"Yumeiro Pâtissière" centers on Ichigo Amano, a clumsy but passionate middle school student with a natural talent for baking. Despite her lack of formal training, Ichigo’s creations often bring joy to those who taste them. Her life takes a dramatic turn when she encounters Henri Lucas, a renowned patissier, who recognizes her potential and invites her to attend St. Marie Academy, a prestigious culinary school specializing in pastry arts. The academy is known for training elite students, many of whom are guided by "Sweets Spirits," magical beings that assist talented patissiers in their craft.

At St. Marie Academy, Ichigo is placed in the "Sweets Princes" group, a trio of exceptionally skilled students: Kashino Makoto, a serious and talented chocolatier; Hanabusa Andou, a charismatic and flamboyant dessert specialist; and Hanabusa Satsuki, Andou’s quiet and methodical twin brother. Despite her initial struggles to keep up with her peers, Ichigo’s determination and unique approach to baking gradually earn her respect. She also forms a bond with her Sweets Spirit, Vanilla, who helps her refine her skills and navigate the challenges of the academy.

The narrative follows Ichigo’s growth as she competes in various baking competitions, faces rivalries, and overcomes personal and professional obstacles. Her journey is marked by her rivalry with the talented but aloof Kashino, whose high standards and critical nature often clash with Ichigo’s more intuitive and heartfelt style. Over time, their relationship evolves from one of tension to mutual respect and camaraderie. The series also explores themes of teamwork, perseverance, and the importance of following one’s passion.

As Ichigo progresses through the academy, she encounters other skilled patissiers, including Lemon Yamagishi, a prodigious young baker with a competitive streak, and Miya Koshiro, a former student who returns as a rival. The story expands beyond the academy as Ichigo and her peers participate in international competitions, showcasing their skills on a global stage. These events test their abilities and deepen their understanding of the art of pastry-making.

The series concludes with Ichigo and her friends graduating from St. Marie Academy, having grown not only as patissiers but also as individuals. Ichigo’s journey from an amateur baker to a confident and skilled professional serves as the core of the narrative, highlighting the transformative power of dedication and creativity in the pursuit of one’s dreams.