The song "NO FUN" by Joji explores the theme of loneliness and isolation. The lyrics depict Joji as feeling disconnected from his friends who are no longer around. The first verse paints a picture of a summer that has ended, leaving Joji feeling abandoned. The chorus repeats the phrase "all my friends no fun" as a way to emphasize his loneliness.

Joji uses the pre-chorus to express his feelings towards the situation. He acknowledges that it's his fault, but he doesn't care. He has withdrawn himself from everyone and keeps to himself. This self-imposed isolation has led him to believe that he doesn't need anyone else and that others are pretending to care about him.

The second verse shows that Joji is struggling to sleep and is verging on the edge of depression. He drives around alone and hides from others, feeling like a king on his throne. However, it's revealed that his cover's blown, suggesting that he may have wanted to keep his loneliness a secret, but it's now been exposed.

The chorus is repeated throughout the song, emphasizing the message that Joji's friends are no longer around, and he's left to drive around on his own. The phrase "all they do is nothing" implies that Joji's friends are not supportive and don't contribute to his happiness.

Overall, "NO FUN" is a song that explores themes of loneliness, isolation, and self-withdrawal. It portrays the idea that even though one may be wealthy, they can still be lonely and devoid of happiness.