Through the looking glass into Camelot Garden, falls a boy named Ryu, whose purpose is to crush this weird, semi-malignant fantasy world. Oh yeah, and the below is a direct quote from the beginning of the story.

The Lady of Shallot
by Alfred Lord Tennyson
There she weaves by night and day
A magic web with colours gay.
She has heard a whisper say,
A curse is on her if she stay
To look down to Camelot.

But in her web she still delights
To weave the mirror’s magic sights:
A funeral, with plumes and lights
And music, came from Camelot.
“I am half-sick of shadows,” said
The Lady of Shalott.
“Tirra lirra, tirra lirra,”
Sang Sir Lancelot.
She left the web: she left the loom:
She looked down to Camelot.

A kingdom in the middle of the desert is the last city of humans that were against the Sand People. However, their next king, Kirameki, didn't want to fulfil the throne. The Sand People took the chance and kidnapped the Prince and replaced him with an imposter, Kirameki's half-brother, Saga, who is a half-human, half Sand Person. Kirameki was made to do hard labour then, but he came back on the day of the Water Festival to get back his Kingdom with Serafita (the Water Goddess)'s help.