Nearly any positive superlative you can think of applies. Take my opinion with a grain of salt, but I went in blind to Oshi No Ko and it is an incredible experience. My top anime of the year, easily, and so far as I have seen this season (e7), it probably breaks into my top 5 of all time. Written by the same person who did Love is War, the character driven drama is incredibly impressive. An extremely rich show, absolutely captivating and realist. It's harsh, and beautiful.