Itoshi Rin, the head of guards has been assigned to war for a couple of months, letting his beloved princess left behind to protect his kingdom.

You, Princess of Caléstia was left by your partner to war. Hoping he'd return with perfect shape, now doing your usual duty as a Princess and a sister. Your father often lend you your older sister's duty yet you weren't crowned because you broke the royal rule, engaged with someone who isn't in the royal blood.

You didn't mind as long as you and Rin were happy, living outside of the castle would be possible.