Through the city of Sendai runs the Hirose River. It has several stream pools along its course, one of which is known as Kashikobuchi, or the Wise Abyss, and there is a chilling legend that accounts for its name. Once upon a time, a local man was fishing by this stream pool when he found a gossamer thread tied around his ankle. Finding it strange, the man undid it and instead tied it around the trunk of a nearby willow tree. The same thing happened over and over again, until…