A rather unimportant plot irrelevant to what follows after

A mysterious item called "Mogoshi" that Merry brought back from one of her dreams turns out to be a tool for catching skyfish. Renko and Merry immediately head to Mt. Rokko, where a skyfish colony(?) is said to exist, but... "Rods" (also known as "skyfish") are elongated visual artifacts appearing in photographic images and video recordings that some claim are paranormal in nature.

Mogoshi See explanation to the left

The true identity of the skyfish is insects that appear when you shoot photos.

The duo was on their way home.