Aoishiro

The Seijou Girls Academy's Kendo Club is traveling to Shoushinji for summer training camp. Near there is an island, Urashima, where a demon extermination took place long ago. They arrive around the time of a festival which honors a god that is worshipped by the people of Urashima, it celebrates the onitaiji and ensure another year of health for the people. Around the time of the festival, the weather around Urashima worsens and storms will come.