Mermaid no Kisetsu ~Curtain Call~

Curtain Call is a fan disc for the Mermaid no Kisetsu romance adventure visual novel. This fan disc includes many sub-scenarios as well as a prelude scenario that tells the story before the actual game happening, one week earlier to the events of the main game. In addition this game includes several voice dramas, a DJ mode with the main characters on air radio, a conversation mode where you can communicate with one of the four heroines, and a quiz mode with 900 questions related to the game in total. There is also a lot of bonus content including illustrations from various CG artists that worked on the game, CG modes showing event scenes from the main game, a bonus movie and scrollable artwork.

[from MobyGames]