In the land of Nirai Kanai, there are two realms, one that is the outside world, and another that is inside and hidden from the rest of reality. At the request of the holy Himegami, Syaoran ventures into this inside realm to investigate an anomaly, but what he sees there is very different from what Fai and Kurogane see. What does this discrepancy mean, and what can they do to overcome it?!