Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @ChibiReviews Post series depression can be quite bad, but it will get better, I bet someone will pick the novel soon in the west.
This tweet contains emotions: 
optimism, sadness