Kenneth Arnold features in "Kore ga UFO da! Soratobu Enban" as a historical figure presented through documentary-style animation. The anime depicts his famous UFO sighting near Mount Rainier on June 24, 1947, where he observed nine crescent-shaped unidentified flying objects moving at extraordinary speeds. This event anchors modern UFO lore within the film's narrative. Arnold's subsequent media interactions are recreated, emphasizing his description of the objects' motion resembling "saucers skipping on water," a phrase that propelled the term "flying saucer" into public use. His account emerges as a catalyst for heightened UFO interest in the post-war era. The portrayal strictly confines itself to Arnold's historical role as a witness, avoiding personal backstory, character development, or fictional arcs. His testimony integrates into the semi-documentary format alongside other UFO reports and speculative content, without added dialogue or traits beyond established records.