Tree World, a gigantic place inhabited by peaceful human-sized insects, come under attack by the Black Witch who seeks the legendary stones that in former times were what gave dragons their strength and that will make whoever possesses them the most powerful being in the world. In the midst of the general mayhem, Vinson the cicada remembers the old song that tells about the princess of Tuan being one who speaks with dragons and who will save Tree World. Arigato the ant departs in search of Fantaghiró...