Demon City Shinjuku
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Demon City Shinjuku is a late 1980s Dark Urban Fantasy Japanese novel turned OAV set inside the region of Tokyo known as Shinjuku after a powerful black mage performed a ritual that partially summoned hell to Earth, splintering Shinjuku with a massive earthquake (that oh-so-subtly carved an enormous pentagram into the city when seen from above) and infesting the city with demons and monsters.
This series is /tg/-relevant mainly because it's one of several popular late 80s-early 2000s anime to get licensed by Guardians of Order, either as setting splatbooks for Big Eyes, Small Mouth or fully marketed as "The Roleplaying Game" of their respective series. Somehow. Despite the whole scenario being pretty decisively wrapped up in the course of the OAV.