Jun, Ippei, Yuriko and their friends become lost in a thick fog driving back from a party near the coast. In need of shelter for the night, they stumble across an abandoned mansion, standing in the middle of the swamplands. This reminds Jun of an old story concerning a Baron, obsessed with spiders, who went mad when his betrothed daughter went missing in the swamp after being bitten by a poisonous tarantula. According to legend, she and her father were transformed into giant arachnids. Legend? The truth, as the group learns, when a pair of massive spiders attack them.
