Princess Sapphire's Kingdom Hearts: Birth by Sleep

Here's the cast of the prequel, Princess Sapphire's Kingdom Hearts: Birth by Sleep.
 * Ventus - Astro Boy (Astro Boy)
 * Terra - Professor Ochanomizu (Astro Boy)
 * Aqua - Astro Girl (Astro Boy)
 * Master Xehanort - Ham Egg (Astro Boy)
 * Vanitas - Atlas (Astro Boy)