Princess Leilia of the small, weak kingdom of Barkos is a lively and mischievous young woman. In order to protect her homeland from a ruthless great power, she accepts a marriage proposal from a neighboring country.

However, her fiancé, the crown prince, already has someone he loves. On top of that, he lays down ten outrageous conditions, including:

You’ll only be my fiancée for the time being

Do not appear in public

Do not speak with me …and more!

Faced with the arrogant prince who uses his superior position against her, Leilia declares:
“I’ll fix that rotten attitude of yours!”

But before she knows it, she finds herself drawing unexpectedly close to the crown prince――!?