Saya no Uta (????, Saya's Song) is an eroge visual novel by Nitroplus with gore and horror elements.
Some fans consider the plot to be Lovecraft-like. Although direct references to the Cthulhu mythos are minimal, the dark, eerie atmosphere reminds people of his works. Nitroplus is also known for the production of the heavily Mythos-inspired Demonbane series.
Basically, this is a great eroge/horror game. Two pictures to demonstrate:
This torrent doesn't require installation. The translation is included, and it doesn't have to be installed either. Just unrar the file, and you're done. Enjoy.