Uwanosora kara Kaettekuru

The protagonist is with friends but bored with the conversation. His mind often slips away to his own imaginary world and comes back to them. So their conversation doesn’t go along very well. In several trips to his own imagination he gradually feels it void and became interested in chain of conversation and the development of the relationship with other people. Then he decided to com back to the conversation.

(Source: Geidai Animation)