From the introduction:
Welcome to Morioh, Japan, circa 1999! It's a peaceful and quiet little town, far from the machinations of egomaniacal vampires and ancient Aztec monsters with such lofty goals as ruling the world or becoming the pinnacle of life. This is a peaceful place where normal people can live out a simple, quiet life. Still, things are not quite what they seem in the idyllic town. Long ago before his defeat, DIO had received a set of arrows which could grant stands to anyone they pierced if that person has potential. Eventually two of these arrows found their way to Morioh and now the owner of one of them, armed with a bow, has been going around granting random people stands in an effort to locate a specific ability. This situation has begun to disrupt the peaceful life of Morioh.