Kouta Meoshi is normally a shut-in and doesn't visit crowded places like amusement parks, though he decided to attend the opening day ceremony of the park due to a fighting game competition that was for that day only.
Kouta is extremely quiet and gets nervous easily, though he is the most knowledgeable about the video games. He explains each attractions' original goal and how they would normally be beaten in the video games.
Spoilers
When Kouta was a kid, he was the only eyewitness to a bus crash, but due to his anxious nature, he was unable to give a report of what truly happened.