Onibi

Onibi is a Japanese word that means "demon fire" or "ghost fire". It is a type of mysterious light that appears at night in the countryside. Onibi usually appears in marshy areas, rivers, or graveyards.

Imagine a tiny fairy light. Onibi looks like that but much, much brighter. It can be green or blue or sometimes even red. It appears as if it's floating in the air and moves around on its own.

People used to believe that Onibi was caused by the spirits of the dead. They thought that it was a way for the dead to communicate with the living. Some people still believe that Onibi is a supernatural phenomenon.

However, science has a different explanation. Onibi is actually caused by gases that are produced by decaying plants in marshy areas. The gases ignite and create a bright spark of light. This is similar to what we see when a match is lit.

So, in summary, onibi is a glowing light that sometimes appears in the countryside at night. It is thought to be caused by the spirits of the dead by some people, but it is actually caused by gases produced by decaying plants.