"The Different World Magic is Too Behind!" centers on Suimei Yakagi, a modern-day magician from Earth who finds himself transported to a fantasy world alongside his friends, Felmenia and Titania. This world, governed by traditional fantasy tropes, relies on elemental magic systems that Suimei deems outdated and inefficient compared to the advanced magecraft he practices. His expertise in modern magic, rooted in scientific principles and complex formulas, allows him to outperform the local mages and warriors, often leaving them bewildered by his unconventional methods.

The narrative explores Suimei's struggle to adapt to this new world while maintaining his identity as a practitioner of Earth's superior magic. His companions, Felmenia and Titania, serve as foils, representing the traditional magical systems of the fantasy world. Felmenia, a former noble mage, initially clashes with Suimei due to her pride in her own abilities but gradually comes to respect his prowess. Titania, a skilled swordswoman, provides a grounded perspective, often mediating between Suimei and the locals.

As Suimei navigates the fantasy world, he encounters various factions, including kingdoms, demon lords, and ancient beings, each with their own agendas. His advanced magic becomes both a tool for survival and a source of conflict, as it challenges the established order and attracts the attention of powerful entities. The story delves into the cultural and ideological clashes between Suimei's modern mindset and the medieval-like society of the fantasy world, highlighting themes of progress, tradition, and the nature of power.

The series balances action, strategy, and character development, with Suimei often using his intellect and knowledge to outmaneuver opponents rather than relying solely on brute force. The interactions between Suimei and the inhabitants of the fantasy world provide insight into the limitations and potential of both magical systems, creating a dynamic narrative that questions the boundaries of magic and innovation.