Taken from Cross Infinite World:

The small kingdom of Steliol is rife with the machinations of nobles and politics. Princess Salia, the 17-year-old daughter of the king, rules the country with the people's support. She is gifted with beauty, an aptitude for politics, and has the blessing of her kingdom's god. She even dared to invade a neighboring country to stop a war and succeeded.

Princess Salia is the definition of noblesse among her people, when in a sudden twist she decides to study abroad in Japan.

Will Salia's abrupt decision give her enemies the chance they seek to eliminate this princess for good? Those who seek to do her harm will have to contend with her royal bodyguard and the special agents assigned to protect her first.