The theater holds an open-air history play in mid-summer, taking place at a national historic site, Goryokaku. It was started in 1988, inspired by the Le Puy du Fou open-air theater in France. It is acted out by Hakodate locals. The play simply explains the eventful history of Hakodate, such as the age of the Ainu people, the opening of the port of Hakodate, the Hakodate War, and the great fires.

※Foreign tourists can use the simultaneous translation APP (UD Talk) on their smartphones to enjoy the performances through audio or subtitles. (Supports 155 languages)