Summoned in another world, the class where Kyoushiro Kagami were summoned was none other than a fantasy one. Believed to be a Demon Spawn that came from the Demon God, Kyoushiro was ostracize more than his classmates and teacher were. Having a few girls falling for him, him and the others strive to save the world they were summoned in; in order for them to go home. Kyoushiro however, suffered from being betrayed by a classmate which lead him to feel deep hatred towards the person that used him...

Upon his death, the king had dictated that the queen would rule until she remarried, but her refusal to do so has the nation of Ethios in turmoil. Greedy for power and her cruelty knowing no limits, the queen has even reinstated the slave trade long since outlawed by her husband upon his ascension. A glimmer of hope for a suffering nation arises in a small baby. The Royal Sage has procured the late king's bastard son and has stolen him away to the city slums to live with Harren, a man who bravely rescues orphans from slavery. Naming the boy Kyran, Harren takes him in with the promise of one day returning him to his rightful place on the throne. Ten years later, these plans are dashed when Kyran is exposed to the queen. Harren must race to the safety of the Riverlands, who hold no love for the queen, if there is any chance to save his son, and future king. Saving Kyran saves the nation. If the queen is to be dethroned, the boy must claim his Birthright.