Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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