Okay so there's some explanation warranted here:

Jorogumo or joro spiders are large, brightly coloured spiders from Japan that have recently been found in North America for the first time. Due to their ability to balloon tremendous distances and their cold-tolerance, they are expected to proliferate throughout the North-East and may make it into Canada. Since they are one of the few predators that will eat brown marmorated stinkbugs, a major agricultural pest, there's a silver lining to this whole situation.

Jorogumo are also yokai, who are able to take a human shape after living for 400 years. They are female monsters since they habitually eat their mates, even as spiders, thus although the male spiders may have the potential to become seductive shapeshifters, they don't have the opportunity.

That brings us to Jorosuke - a male joro spider who lived alone in a remote shrine for hundreds of years, quietly spinning golden silk for the priestesses in exchange for a warm place to sleep each winter. When the shrine was abandoned following a period of great hardship, he continue to take care of it alone. One winter while hibernating as a spider, the shrine's contents were boxed up and were to be sent to Tokyo for preservation, but an error on the crate's packing slip had his box shipped with farm equipment to another country.

...so really it was an excuse to draw a shape-shifting spider boy on magical gay adventures.