What's an anime that made you sad, but the said anime isn't actually sad?

This is pretty odd but I just watched the first episode of "How heavy are the dumbbells you lift?" and it made me realise how inconsistent I am with the gym and how I'm barely trying. It put me in a pretty bad mood but I'm also more motivated to go to the gym.

What anime have you watched that made you sad, but the anime itself isn't actually sad?

1. One Punch Man - It has its sad moment.

2. ReLIFE - "It's the journey, not the destination" and similar quotes probably apply here, but I'm still going to be sad about it.

3. Shinchou Yuusha: Kono Yuusha ga Ore Tueee Kuse ni Shinchou Sugiru - I thought the goddess was just annoying but that twist