There was a time when there was nothing but cruelty in this world. And this was a time when humanity came to be.The whole humanity slaves to cruel and heartless demons. Who were merciless savages, the humans used to do their slavery and if they had disobeyed them or refused they would get killed mercilessly. There used to be different realms created by "The celestials". The celestials were like guardians of humanity. They made rules and ensured justice. But when demons took over humanity they wiped out the rulers of the celestials and made sure no one was left from the royal bloodline. It was true that the demons were stronger than celestials but, celestials did have weapons that could kill them. Demons were immortal and could not be killed by any other object, power, or anything made by man. There are in total of three realms, one that celestials lived in , the second in which demons exist, and the third was created to banish people into time space where they can never escape or either seal them.
The seal requires an anchor. An anchor is supposed to balance the existence of that person, and by balancing meaning the anchor has to be as powerful as the one being sealed.
Kaguya hoshikawa, a 20 year old knight who just got promoted to being a royal knight to serve the queen and live her life in the royal palace. Kaguya comes across a truth that she regrets finding out. A 5th ranked knight who just got promoted to a royal knight would anyone believe her when she tries to reveal the true colours of the people ruling the kingdom?