Unlocks the background image - Snowy Forest.
This dense forest at the border of the Northland is covered with a thick layer of snow in winter. Those who enter this picturesque forest by mistake often get lost in it.
Use to unlock Background - Summer Night Party.
At the peak of the summer night party, the girls gave themselves over to the music. Although the party is over, it's as if we can still hear their laughter and singing.