Shounen Ga Otona Ni Natta Natsu - Episode 2 ((link)) Site

But we never learn why she cried under the fireworks. The show trusts us to understand: she doesn’t know either . That’s the point.

If you want, I can:

Episode 2 solidifies the show’s thesis: becoming an adult is not about understanding, but about accepting that you don’t understand, and learning to smile anyway. shounen ga otona ni natta natsu - episode 2