The colours and style of the gate are inspired by
Ryūgū-jō, according to the Shimonoseki Tourist Guidebook published by the Shimonoseki City Tourism Department. This source states that Antoku's grandmother,
Nii-no-Ama, who drowned with Antoku, wished for their palace to be created underwater as she jumped into the sea. Ryūgū-jō is a mythical underwater palace, belonging to the
dragon god of the sea. In the
Tale of Heike, Nii-no-Ama told Antoku, before jumping, that they would go to an underwater palace, without referring to Ryūgū-jō. Then, Antoku's mother (Kenreimon-In, aka
Taira no Tokuko) had a dream, in which they were living in Ryūgū-jō. Inside, in the Hoichi Hall, is a statue of
Hoichi the Earless, one of the characters in a traditional ghost story which was made known in the west by
Lafcadio Hearn. The grounds also contain the Nanamori-zuka (seven mounds), which represent the Heike warriors also lost in the Battle of Dan-no-Ura. ==Kanpei-sha==