Advocate of Illusions Tsubasa kuronikuru : Season 1 Episode 13

The group end up in a new world, Jade Country, where there is an old legend story about a golden haired princess who possessed a feather with magical powers and they are convinced that it belongs to Sakura so they go to a forbidden castle with a deep river surrounding it to try find some children that were abducted. While they are in town, they are taking refuge in the house of a kind doctor, Kyle. But while everyone is asleep, Sakura sees the golden haired princess and follows her but then she is suddenly put to sleep. Now Sakura is getting the blame for taking the children and Syaoran is worried that she will never come back alive.