"Omori District History" is described as below ;
This hill is in the Shimonumabe. The regent Hojo Tokiyori came in pilgrimage to Nakahara. It was hard to heal suffering from the disease. Well water is immediately healed was used there. The well had one by one in Nakahara and Numabe.
After that, well of Nakahara was transferred to Numabe.
Then, transfer the Nakahara of well to Numabe, they have been called to as the female of the well (Mei) , male of the well (Oi). Oito slope is that of male well hill.