Kikaku Hazure no Eiyuu ni Sodaterareta, Joushiki Hazure no Mahou Kenshi

After sacrificing his life in a tragic accident to protect a young girl, an ordinary young man finds himself reborn into an entirely different world. Alone and vulnerable in this unfamiliar realm, he is soon discovered and taken in by a mysterious old man who offers him shelter and a new beginning. However, this seemingly kind elder is far from an average caretaker. He is, in fact, a legendary hero whose extraordinary nature has left him completely detached from the everyday common sense of the world. Raised under the unconventional guidance of this eccentric powerhouse, the boy’s childhood is anything but normal. Immersed in a lifestyle that defies all standard logic, he gradually matures into a formidable magic swordsman shaped entirely by his guardian's bizarre teachings. The skills and peculiar worldview instilled in him by the hero set him on a path vastly different from any ordinary adventurer. As he steps out into the wider world, the young swordsman’s unique upbringing begins to yield unexpected results. Armed with overwhelming abilities and a perspective untethered by conventional norms, he quickly draws attention wherever he goes. Before long, his extraordinary journey leads him to attract a colorful cast of companions, setting the stage for a remarkable adventure and the surprising formation of his own growing harem.