Juvenile

The music video centers around Hatsune Miku and Eevee. True to its fame for evolution, the intro and outro incorporate the in-game evolution BGM melody, with the intro also featuring the intro BGM at its end. The guitar melody in the early part is the Kanto Route 24 BGM. Furthermore, in the latter part where the character sees their younger self, the Hall of Fame BGM plays. This likely signifies becoming the Champion by winning the final battle and cheering on one's own naive and weak past self. Additionally, from the point where Miku ties her hair and the battle begins, she hums the gym battle highlight from Scarlet and Violet. The song title, Juvenile, means 'of a boy or girl.' -Source: Namu Wiki document (2026.08.31)