 Within the grounds of the shrine is the opening of a tunnel, the , that is said to have connected the Sanada Maru to Osaka Castle during the siege.The number of worshippers visiting the shrine has increased dramatically since the shrine has been featured in the 2016 NHK taiga drama "Sanada Maru".However, recent research by Yoshihiro Senda, Professor of Archeology and President of Nara University, concluded that the Sanada Maru was likely located several hundred metres away from the shrine.