Skill Tracer

Since the age of four, when his parents passed away, he learned ancient martial arts under his grandfather, a Living National Treasure, and studied combat and killing techniques while living in Japan. One day, as he was about to graduate high school, he got caught up in an inhumane magic that "forcibly summoned [him] from another world and enslaved [him]." What he saw next was not another world——but his parents, who were supposed to be dead. His parents, who had continued to watch over him as guardian spirits even after death, couldn't prevent the otherworldly transfer itself, but succeeded in rewriting only the "enslavement" part with a different power. The powers he was given were: a game-like menu function that his mother created with full enthusiasm, and a "skill that allows him to copy any skill he's seen once and make it his own"——adjusted by his father to match his son, who was skilled at learning by observation. ※This is, so to speak, a template for the typical "protagonist is strongest in another world" and "learning-type" otherworldly transfer story. It includes harem elements. ※Retitled from "When I Went to Another World, I Became Able to Copy Abilities."