A romantic story taking place in the "Knights of the Round Table" epoch..

When he comes back to Japan after 10 years abroad, Chihiro offers a strange ring to his childhood friend and neighbor, Mana. Actually, this common-looking jewel possesses a magic power which can take the girl to a strange land called Avalon. There, she will meet a young boy named Lancelot and learn that he is in fact prisoner of this land...