"Vigaku" is the character theme for Ein, and is used in all of his appearances in the series, with exception to the arcade version of Dead or Alive 2. It is also his ending theme in the console versions of Dead or Alive 2. The theme is later heard in the background at Johnny's Diner in Dead or Alive 5. The theme is also optional in the Music Mode in Dead or Alive 5 Ultimate, and can be selectable for any character and gameplay mode.