What anime made you depressed or gave you extreme post anime depression?

brand new animal gave me post anime depression, idk why , the anime isnt even sad or anything but i was so into the story and the characters were so good, not only that but their filler was like so fun to watch. that when it was over it didnt rly feel real, suddenly i felt rly empty and i miss it a lot. WAITING FOR A SECOND SEASON!