There’s one Another Episode for each bachelor and bachelorette + Ventuswill, making it 13 different Another Episodes in total. The one with Ventuswill is free, and the other 12 Another Episodes are sold in a pack for 700 Yen.
Another Episode themselves, they are akin to Drama CDs and are called “Voice Dramas”. They’re fully voiced stories with brand new illustrations. Each Another Episode depicts new stories not found in the original game.