This is Dead or Alive soundtrack.

Publishers

She is a bonus character designed for Dead or Alive 2 that they threw in to the PSX version.

[4] Maxim gave the game a score of eight out of ten and stated that "The sharp graphics and advanced jiggle physics will no doubt prick the interest of lonely gamers, but surprisingly, the game's volleyball action is pretty solid.

This quickly led to users replacing the already revealing swimsuits with high detailed nude textures including genitalia and pubic hair for all in game characters.
Commercial

Then, select costume 14 (for female characters) or 5 (for male characters) and beat the game under the normal difficulty level and default settings. This resulted in fully nude female characters that would lounge about and play volleyball with full breast and buttocks physics intact.