It is a seashell from nearby shop. The shop was 60ish feet from where this was filmed. This has been debunked for a while now. If you look close you can see the swirl pattern near her ring finger, but you have to be quick.

Tymberwulf is right here. They were seen diving for some of the many insects that are attracted to the light. As is their instinct they were gorging on prey. They caught an opportune moment to feed so as to bulk up for their migration most likely. WIRED is way off on this one.

I can tell you from experience, the homeless situation in Japan is far from this clean or orderly. THIS is a public face. The homeless are not tolerated near city centers and are often spirited away to the rural area. My family there often took in the homeless as agricultural workers on our properties. Many were single mothers who were terribly (shockingly) abused and violated by Japanese men. A good deal of them became as close as family to us since their own families often shunned them as failures. A good portion of homeless people in the rural area could be classified as far from clean or respectable/honorable though. Many are very cut throat, even when opportunities are offered to them from a kind person.

The few homeless that remain in the city are VERY much functional. Often they are barely below the poverty level compared to others that end up in the rural portions of the country. Often the mentally or physically handicapped, provided they are not violent or a nuisance, are tolerated as well in the city. They make up a large growing portion of the homeless. Mental illness is rampant in Japan, but it is rarely spoken of.