Ep. 11: Airi untersucht mysteriöse Geräusche in den Yoshimi Hundert Höhlen in Saitama

11

After leaving Nikko, Airi hears a mysterious sound only she can hear. They head to the origins of that sound, to find out that it's the Yoshimi Hundred Caves in Saitama, a historical site. (Source: Crunchyroll)