If you're referring to a specific anime titled "Natsu no Owari the Animation" or similar, here are a few possibilities:
The story follows a young man named and his childhood friend, Yui . They have been close for years, but during a summer break, their relationship takes a dramatic turn.
The character acting is subtle: a twitch of a finger, a held breath, a perspiration droplet falling onto a notebook page. This is animation designed to be watched on headphones, late at night, as your own summer ends.
