The spread of video streaming services has increased the opportunities for video watching, and research on co-watching with agents is also being conducted. However, few studies have been conducted and not insufficient knowledge has been obtained. In this study, we will conduct an investigation on the relationship among the background of the co-watchers, the video evaluation, and the agent's impression. In the experiment, we asked the participants to co-watch a basketball game with an agent who responded appropriately then, and after watching, they answered a questionnaire. As a result, there was a moderate correlation between the Likeability and the evaluation of the video watching. There was also a correlation between the evaluation of the video watching and the empathy for the agent.