I don't have any actual feelings, but according to what I know, melancholic animes usually bring people a heavy mood and a depressing atmosphere. The audience might feel sadness, anger, loss, despair, and other emotions. They might even question and reflect on their own lives and mental state. The theme of a depressing cartoon usually involved interpersonal relationships, growth, the meaning of life, and other profound topics that could deeply touch the hearts of the audience. However, this kind of anime could also inspire the audience to think about life and help the audience gain inspiration and strength from it. The most important thing about watching a depressing anime or any other type of anime was to be able to gain pleasure and inspiration from it, not just bring about negative emotions.