The episode humorously but poignantly depicts Hinata's anxiety through his inability to sleep and subsequent motion sickness on the bus ride to their first practice match.
We see a more mature side of Kageyama as he acknowledges Sugawara's existing bond with the team, realizing that trust cannot be built overnight. Setting the Stage for Aoba Johsai
Kageyama tells Hinata that if he isn't effective as a decoy, their other attacks will fail. This creates immense psychological pressure for Hinata, who fears being a "weak link" or easily replaced.
Episode 5 is vital for its shift in tone. While the first four episodes focused on the rivalry between Hinata and Kageyama, this episode turns them into a unit. It effectively uses humor—such as the "Tanaka boxer shorts" incident—to balance the heavy themes of performance anxiety and the daunting challenge of facing a top-tier team.
Aoba Johsai only agreed to the match if Kageyama plays as the setter for the entire game.