About 1300 years ago, there were two beautiful sisters in a city that was far south. They were searching for their missing father, and traveled many countries tracing their father’s footsteps. When they reached here, they found out their father had already gone. In despair, the older sister, Tamayo, threw herself into the lake. Then a water monster rose out of the lake and attacked the younger sister, Katsuyo. Katsuyo transformed herself into a huge serpent and defeated the monster. She inherited the watery kingdom and will reighn in it forever. Now the lake where Tamayo died is called Ane-numa (Old Sister Marsh), The lake where Katsuyo sank is known as Lake Ogawara or Imoto-numa (Younger Sister Marsh). You can see here Tamayo revived as the left statue looking up at a blessing of Mt. Hakkoda. Katsuyo is here as the right statue praying for safety and happiness of the lake.