Once upon a time, a mother and son lived in a place called sulfur in Iiyama, Shinano Shiwanai Prefecture (present-day Iiyama City, Moto-Nagano Prefecture).
Mother and son depend on each other and live a poor life. For some reason, one day my son suddenly fell ill in bed, very painful, and often said in his mouth: "The spider is coming, the spider is coming."
The mother, who had been taking care of her son, wanted to trample the spider to death, but she couldn't see the spider that her son said. Probably because her beloved son's heartfelt mood touched the heavens and the earth, the mother finally saw the spider.
On this day, she desperately suppressed the spider hiding under the futon, but she could not defeat the big spider with divine power. The spider used its divine power to wrap the mother's body with spider silk.
At this time, she heard her cry for help, and the people from the same village used axes and wood knives to cut the spider silk and killed the spider. Such a large spider is simply rare in the world.
After the big spider was killed, his son's illness slowly healed. Probably because he was sucked blood by a spider, there were many places on his body that began to molt. But the good guy saved his life, although for a long time after his recovery, he still had to rely on crutches to walk. This is the story of the great spider that spreads in Japanese folklore.