is a visual novel that was originally a Playstation 2 and Dreamcast release, but was recently translated and ported for the Windows platform by Hirameki International Group.
The game starts off with a scenic view of LeMU, a futuristic marine theme park located at the bottom of the ocean. An unfortunate incident causes your protagonist and six other occupants to be trapped in the construction. Follow their adventures as they search for an escape before time runs out.
There's a lot of text to read and storyline changes depending on your decisions at certain key points. To discover the entire plot several playthroughs are required.