An explanatory board at the Hagoromoike Pond site describes it as a "tea water well." It is believed to have served as a precious drinking water source for the soldiers of Ueshi Castle in the past. The Ueshi Nanjoki (military records) states, "Fresh water gushes from the north cave, and even during drought, it never dries up." Legend has it that if all the water in this well is drained, a heavy rain will fall. Additionally, there is a legend that a celestial maiden used to bathe in this well.