Seirin is the only outcast of an Elite Family. With great effort, He barely able to get into work as a tutor of a foreign princess for... the last princess of Shimuru main branch family. Mine is still an innocent 13 years old princess, a graceful lady── or maybe not. Doesn't like being selfish and rampaging super problematic child. While Seirin is having a headache, he kind of want Mine to be princess like. Also somehow, Princess Hime is being attached to Seirin as a teacher. But, The Empire who supposed to have signed a peace treaty with Shimuru has declared a war. It become a dilemma for Seirin, could it be a big step to become a Hero!?