Imagine waking up, not in your bed, but in the pages of a fantasy novel you once read. That's the bizarre reality for our protagonist, a former life coach whose overwork led to an unexpected transmigration. He finds himself as the seemingly useless older brother to Theodore, the oblivious hero of "Destiny's Harem Knight," a tale where saving the world hinges on forging romantic alliances. The mission seems straightforward: leverage his coaching skills to guide Theodore toward his destined heroines and prevent the rise of a devastating Demon Lord. But fate, it seems, has a wicked sense of humor. Our protagonist's well-intentioned "help" yields unforeseen consequences. Instead of guiding his brother, he inadvertently captures the attention of the very women Theodore needs to unite with. His brother's stoic mentor, his fiancée's formidable sister, his rival's legendary mother, and even a centuries-old elf begin to see him in a different light. Suddenly, he's neck-deep in a harem of his own making, threatening the delicate balance of destiny. "The Protagonist's Useless Brother" promises a comedic twist on the isekai genre, blending fantasy adventure with romantic mishaps. If you enjoy stories where good intentions pave the road to hilarious chaos, this might be your next favorite read. Will he manage to untangle this web of affection and set his brother back on the path to saving the world, or will his accidental harem doom them all?