While visiting her composer mother in Germany, Yuna injures herself and finds herself saved by a mysterious long-haired knight who dubs her his queen. When Yuna returns to Korea, she is faced
with trouble with her family and classmates. She goes to bed crying at night, which causes the knight, Rieno, to worry about Phantasma, the country she has become queen of and whether it will
see anything beyond the bleak winter of the queen's sadness.