What happened
Two seven-year-old cousins were roller-skating near their housing estate in Kōfu at dusk when two glowing orange objects appeared overhead. Frightened when the lights seemed to follow them, the boys hid in a graveyard; one object flew off toward Mount Atago. Walking home, they saw a flame-like glow and followed it to a vineyard, where they said a silver, dome-topped disc rested among the vines, marked with unfamiliar characters. A short, brown, deeply wrinkled figure with pointed ears and metallic fangs stepped out, and Katsuhiro felt two taps on his shoulder before collapsing in fear; Masato carried him away. Their mothers came back and reported an orange light in the vineyard. Next day concrete vine posts were found knocked over, the wire netting pressed down as if by a weight, and holes in the soil. The boys' consistent accounts and drawings made national news, and the case remains one of Japan's best known.
The official explanation
Skeptics in Japan note that the broken vine posts were surrounded by undamaged trees and that a craft of the size described could not physically fit between the posts, details they say have been glossed over. Some local people suspected a story embellished by the children or their families, which led one of the boys to stop discussing it for years. Orange lights at dusk could have been aircraft or other ordinary sources seen by excited children.
The anomalous case
The boys did not change their story, according to accounts of their interviews with family, teachers and reporters, and repeated it under hypnosis in 1982. The light was not seen by them alone: their mothers said they saw an orange or silver object over the vineyard, a caretaker at the city's environment centre reported a light over the spot where the boys had been skating, and an eight-year-old classmate said he saw a glittering object heading toward the estate earlier. Physical damage was documented at the site, including toppled concrete posts and holes in the ground. Japanese press reported that local high school teacher Susumu Maeda took soil samples and found elevated radioactivity that decayed quickly, which reports characterised as artificial. Katsuhiro Yamahata has said the experience still frightens him, and he spoke publicly again at the 50th anniversary in 2025.
The strongest argument that this was something genuinely unknown or classified, with each claim attributed to the person who made it.
Sources
- The Terrifying Aliens of Japan's Kōfu Incident Historic Mysteries
- The Big Three UFO/UAP Incidents in Japan + One! (Ep. 192) Uncanny Japan (Thersa Matsuura)
- 甲府事件 (Kōfu incident) Wikipedia (Japanese)
Witness reports elsewhere
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