This series is an adaptation of a popular fantasy novel by Noriko Ogiwara.

[SYNOPSIS]

On Filiel's 15th birthday, she received her mother's necklace as a memento from her father, an obstinate astronomer.

When she attends to public ball to celebrate Queen's birthday wearing her necklace, however, her common and tedious life was turned into a life of conspiracies.

Her journey of adventures and self-discovery begins!