The music of the song was inspired by the ruins of Oka Castle whereas the lyrics, written by Bansui Doi,were inspired by the ruins of Aoba Castle and Aizuwakamatsu Castle.
castle | Windsor Castle | Castle | Edinburgh Castle | Balmoral Castle | Castle (TV series) | Prague Castle | Castle Donington | Corfe Castle | Castle Hill | Castle Hill, New South Wales | Powis Castle | Roy Castle | Colditz Castle | Castle Combe | New Castle | Nagoya Castle | Dublin Castle | New Castle, Delaware | Lancaster Castle | Hearst Castle | Harold & Kumar Go to White Castle | Cardiff Castle | The Castle of Otranto | Tantallon Castle | Takeshi's Castle | Luttrellstown Castle | Dover Castle | Buda Castle | Bluebeard's Castle |
Also, according to the biography (see below) he became a relative of the famous Kirino Toshiaki, a Brigadier in the Imperial Army that took Aizuwakamatsu Castle from Matsudaira Katamori in 1868 in the Battle of Aizu.