Within the grounds of the shrine is the opening of a tunnel, the "Sanada-no Nuke-ana" (真田の抜け穴), that is said to have connected the Sanada Maru to Osaka Castle during the siege.

[2] 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.

[3] Senda further found that the tunnel on the shrine's grounds is not the legendary passage, but more likely a trench dug by the attacking Maeda forces.

During the rare event, a ring of grass measuring two metres in height is erected within the temple's hall.

After receiving a blessing from the priest, the worshipper steps through the ring while praying for good health and long life.