Overworked to death as a life coach, I found myself transmigrated into a fantasy world as Theodore's unremarkable older brother. With the Demon Lord threatening civilization itself, only one path remains: my brother must unite the four destined heroines in marriage to forge the alliances that will save us all. Armed with my life coaching expertise, I set out to guide my battle-hungry brother through romantic entanglement. But somewhere along the way, something went terribly wrong. My guidance proved far too effective—and directed at entirely the wrong people. Now a stoic instructor, a powerhouse sister of his fiancée, a legendary general's mother, and an ageless elf are all competing for my affection. I've inadvertently become the center of a harem meant for my brother, and with each passing moment, I'm hastening toward the world's inevitable destruction.