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Unbreakable Chains

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Kingdom Hearts Birth by Sleep
Unbreakable Chains
Theme Notes.png
Arranger Takeharu Ishimoto
Composer Takeharu Ishimoto
Length 5:21

"Unbreakable Chains" is a musical theme by Takeharu Ishimoto that appears in Kingdom Hearts Birth by Sleep. It is one of the boss themes of Vanitas.


Kingdom Hearts Birth by Sleep[edit]

Ventus's Story[edit]

  • Dive to the Heart: "Unfinished Union"

Kingdom Hearts Union χ[edit]



"Unbreakable Chains" is five minutes and 21 seconds in Kingdom Hearts Birth by Sleep.

The track is a climactic arrangement of Vanitas's primary boss theme, "Enter the Darkness". As such, it incorporates elements of various themes featured in "Enter the Darkness": "Roxas", "Ventus", and "Sora".