Symbols of Haven
Prologue
Five years have passed since the end of Yuu Yuu Hakusho.
Yuusuke, as the Lord of the Makai, returned from his adventures in the Makai and married Keiko, while Master Genkai opened her temple to demons and spiritually aware humans who needed a place to stay. Kuwabara finally convinced Yukina to date him, and moved out of Shizuru's apartment. Hiei told Yukina of their shared parentage and found her unconditional love and acceptance to be a better healer than he ever dreamed. Kurama still had not informed his human mother as to his demonic nature, but Shiori was happily married to Hatanaka-san and Kurama could now play the role of the loving son from a distance. All four Rekai Tantei retired or were released from active Rekai service, due to the lack of need for their abilities.
But, as always happens after a period of peace, when the possibility of danger seems to be a distant memory, disaster strikes.
After centuries of constant strain, which intensified five years ago as a result of Sayko's and Sensui's meddling, the barrier that protected the Ningenkai from the Makai finally flickered, than failed completely, causing the foreseen apocalypse to commence nearly two hundred years early.
Taken by surprise, the Rekai Tantei teams that were stationed around the world did not stand a chance of turning the waves of demons back. Even though the ranks of Tantei were reinforced by the return of all former detectives, and eventually even spiritually aware Rekai Intelligence workers, the demons swept through the rudimentary forces and wiped out nearly the entire population of humans capable of fighting them. Within weeks, two thirds of the human populace was annihilated, and the Rekai found themselves helpless to stop it.
However, not all Spirit World personnel were taken down in this onslaught. In America, a small division of the remaining Tantei forces established headquarters in Dallas, Texas, and began gathering other detectives and human survivors to them. Slowly, they fought off the invading youkai, and created a border between the realm protected by the Tantei and the land overrun by demons.
Across the globe, other surviving groups of Tantei began emulating this process, until three havens had been created for the human survivors. The American Tantei expanded their control to include most of Texas, New Mexico, and Louisiana, while the European Tantei freed the islands of Ireland and Great Britain, as well as the northern half of France. In Asia, where the youkai were most numerous, Japan's islands were loosened from the demon infestation, as was the easternmost coastline of China. Straggling, broken bands of ragged humans journeyed to these glowing paradises, and the remaining population of the human race was estimated by King Enma to be around two billion.
Still, the establishment of the borders, kept diligently by the Tantei, only slowed the demons' raids against the human race. With nightly attacks on the depleted ranks of the Rekai Tantei, the demons slowly yet effectively began to reduce the number of humans that were capable of standing against them, often singling out a weaker detective and attacking them when they were alone. The numbers of able detectives continued to drop ominously, and any lingering hope for the human race after this calamity faded with it.
New recruits, of both youkai and human decent, were needed to defend the Ningenkai.