Under the light of the eternal full moon, she might be able to stop an ancient grudge... or become another just victim in the calamity it threatens.

When the young oiran-in-training, Yumekawa Kaede, is finally allowed to leave the Yuilen palace to attend her first matsuri she is absolutely thrilled. But after she and her best friend (and guard), Gakuto, inadvertently end up on a ferry bound for the island of Tsuiraku, her simple night out becomes something more. Stuck for a week on the island and with a mysterious bundle of ancient bells in hand, their time will be far from dull.

Along with local girl Yurika, and stalked by the mysterious being known as The Hound of Canaan, Kaede and Gakuto must race to unravel a secret that may reveal the Moon Princess' legend isn't just merely a folktale.