"Magic in This Other World is Too Far Behind!" centers on Suimei Yakagi, a modern-day magician from Japan who is transported to a parallel world alongside his childhood friend, Reiji, and a girl named Liliana. This world is steeped in traditional fantasy elements, including magic, knights, and demons. However, Suimei quickly realizes that the magic system in this world is vastly inferior to the advanced magecraft he has mastered in his own world. While Reiji and Liliana adapt to their new roles as heroes destined to save the world, Suimei remains skeptical of the simplistic and outdated magical practices he encounters.

The narrative explores Suimei's journey as he navigates this unfamiliar world, often clashing with its inhabitants due to his superior knowledge of magic. He encounters various factions, including the Kingdom of Astel, where Reiji and Liliana are celebrated as heroes, and the demonic forces threatening the land. Suimei's pragmatic and analytical approach to magic sets him apart from the more traditional and ritualistic practices of the locals, leading to both conflict and collaboration. His interactions with characters like Felmenia, a noblewoman and magician who becomes his apprentice, and Lefille, a swordswoman with a mysterious past, further deepen the story's exploration of cultural and magical differences.

The plot intertwines Suimei's personal quest to return home with the larger conflict involving the demon invasion. While Reiji and Liliana embrace their roles as heroes, Suimei remains focused on understanding the nature of this world and its magic, often uncovering hidden truths about its history and the origins of its magical systems. The series balances action, humor, and world-building, with Suimei's intellectual prowess and unconventional methods driving much of the narrative tension. The dynamic between the characters, particularly Suimei's relationships with Felmenia and Lefille, adds emotional depth to the story, highlighting themes of trust, growth, and the clash between tradition and innovation.