Batman's Owl Godfather

"What rolls around in an alley with several holes on it?" "The answer is a bowling ball." Bruce Wayne, who lost his parents, chose to travel around the world and learn various skills and knowledge before becoming Batman. Katum, an owl who calls himself the King of Demons, is actually a time traveler bound to Batman. The owl changed the trajectory of little Bruce's travel around the world. Traveling around the world, really traveling around the [world]! Bruce Wayne will start from the American comic world, hone himself in the universe, and become a brand new Batman. Before that, Gotham is waiting for him. This book is also known as: "Bruce Wayne and Hogwarts", "Avengers: Wayne Era", "Where is the Wonderful Bat", "Batman: Heian-kyō Oniden", "The Demon Hunter of the Bat School", "Warhammer: Bruce's Rebellion", etc...