Definitely Attack on Titan,

"Perfect Game", "Hero", and "Midnight Sun", is some of, if not THE, best television out there, period. From drama, to action, to music, to emotional and dramatic weight; the stakes just feel so fucking real, and being able to sell those stakes is I think it's biggest strength.

And this part was only recent surpassed 2 seasons later by "Two Brothers", "Memories of the Future", and "From you, 2000 years ago". Some have claimed this to be the absolute pinnacle of what fiction is capable of when it first released in the book. Two brothers did what the previous sequence did dialed up to 100, memories of the future is the ultimate mic drop and flex as a writer that recontextualizes the entire series, and the last brings the entire series full circle; an absolute masterpiece..... and it only happens half way through the season.