"Someday's Dreamers" is a 12-episode anime series set in a world where magic is a regulated and integrated part of society. The story centers on Yume Kikuchi, a 17-year-old girl from the countryside who travels to Tokyo to train as a licensed mage under the guidance of Masami Oyamada, a seasoned mage instructor. Yume’s journey explores the responsibilities and ethical dilemmas of using magic, as well as the emotional and personal growth required to wield it effectively.

The narrative unfolds as Yume begins her apprenticeship, learning the fundamental rule of magic: it must only be used to bring happiness to others, not for personal gain. Through her training, she encounters various clients seeking magical assistance, each presenting unique challenges that test her understanding of magic and its consequences. These experiences highlight the delicate balance between human desires and the limitations of magical intervention.

Key characters include Masami Oyamada, a reserved and pragmatic mage who serves as Yume’s mentor, and his younger sister, Sayoko, who provides emotional support and insight into the complexities of magic. Other supporting characters, such as Yume’s classmates and clients, further enrich the story by showcasing diverse perspectives on the role of magic in everyday life.

The series delves into themes of empathy, responsibility, and the human condition, using Yume’s interactions and magical assignments to explore how magic can both help and complicate lives. The plot progresses through episodic arcs, each focusing on a specific client or challenge, while maintaining an overarching narrative about Yume’s growth as a mage and her evolving relationship with Masami. The tone remains grounded, emphasizing the emotional and ethical dimensions of magic rather than grandiose or fantastical elements.