On the 16th of August in the late summer, the Daimonji Gozan Okuribi lights up the night sky in a mysterious way. The people of Kyoto see the end of summer as the blazing flames disappear. The most well-known of these is Daimonjiyama (Sakyo Ward, Kyoto City). However, little is known about the time and origin of its establishment. Pursued the mystery of "Dai" wrapped in the darkness of history.