回答
This play is very unique among Joruri plays, for its setting in ancient times, the motif of myths and legends like Ama no Iwato (the Heavenly Rock Cave: the myth that the Goddess of Sun hid herself in the cave), Jusan-gane (Thirteen Bells: the legend that a 13-year-old boy who had killed a deer was punished by Ishikozume) and Kinukake Yanagi (Robe Draped over a Willow: the legend about a court who lady drowned herself in Sarusawa-ike Pond), and particularly its structure similar to current fantasy action, which makes Iruka a horrible monster and the good guys who search for his weakness.
古代を舞台にし、天の岩戸・十三鐘・絹懸柳などの神話伝説をモチーフにしている点、とりわけ入鹿を恐るべき怪物にし、その弱点を求めて善玉が活躍するという現代のファンタジーアクションに通じる構成は、他の浄瑠璃作品と比べ極めて異色。
http://ejje.weblio.jp/sentence/content/old+guys