Two round stones that were once in Suma Seaside Park. Its identity is still wrapped in a mystery, and it is said to be a stone in the garden of the residence that was built before. There is a theory that it is the basis of a lantern because it was in the mansion, but the truth is not known. Now I am playing with my child using it as a sama or as a singing stage. It may be a good idea to look at such a mysterious stone and think about the history of Suma Kaihin Park and the life at the time.