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noun, の adjective
A shinto shrine courts are the courts of the Shinto shrines. Shinto is often associated with the emperor, which is why this the imperial court. Royal court will do as well.
The reading for 宮 is one you haven't seen before. Just think about how cute (きゅう) this imperial court is. It's a My Little Pony imperial court, or something.
A chest cold is going around the Imperial Court.