Minobi is a will-o’-the-wisp–like fire said to appear as tiny lights dotting a straw rain cloak on boats crossing Lake Biwa, especially on rainy nights in the rainy season. It neither burns nor spreads; if the cloak is removed, the lights vanish. Brushing at them makes them multiply, glittering like starlight. Some traditions call it the manifestation of drowned spirits, while modern views liken it to a kind of gaseous luminescence; similar reports exist across Japan.
Folklore & Legends
In Hikone, Omi, people say that on rainy nights in the fifth lunar month, small lights cling to a boater’s straw cloak; swatting them only increases their number, but taking off the cloak makes them disappear. In Hokuriku, Echigo, and Dewa, they’re called names like “Minomushibi” or “Minoboshi,” attaching to clothing or umbrellas on rainy journeys or at sea. Some can see them while others cannot, and one might say a person is “possessed by a bagworm” (minomushi). Lighting a flame drives them off, and if left alone they fade after a while.
Yokai Cards2
Minobi (Rain-cloak Fire) across multiple art-style decks
Typified by records tracing to Lake Biwa, it is a collective form of strange lights that cling in faint specks to rain cloaks, umbrellas, and garments on rainy nights. They carry no heat and increase in brightness and number when brushed at, yet disperse naturally when garments are removed, a flame is lit, or time passes. Names and interpretations vary by region, with some seeing them as spirits of drowning victims, others as animal tricks or natural bioluminescence. Rather than causing harm, they are said to bewilder and unsettle, and are often visible only to solitary individuals.
Character Profile
This section is our own creative profile for storytelling. It is not historical fact or scholarship.
adheres and multiplies as firefly-like glimmersshifts position in response to the target’s movementsvisual disruption dividing those who can see from those who cannotdissipates over time or when a light is kindled
Weaknesses
disappears when rain cloaks or garments are removed, repelled by lamplight and disperses easily, manifestation ceases with changes in wind or rain
Habitat
Omi Province and the Lake Biwa region, Echigo along the Shinano River basin, Dewa Province Senboku District, Echizen Province Sakai District
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