Born into a prestigious family, Seirin stands as the odd one out. Against the odds, he lands a job tutoring the youngest princess of the Shimuru main family, Mine. Despite her tender age of 13, Mine harbors a rebellious nature that clashes with her royal status. As Seirin grapples with this spirited charge, he yearns to cultivate her into a true princess. Unexpectedly, another princess, Hime, forms a close bond with Seirin, complicating his role further. Just as things seem to settle, the Empire, bound by peace with Shimuru, declares war. Caught in the turmoil, Seirin faces a crucial choice - could this be his chance to rise as a hero?