This is a free visual novel. The version at the above link is rated PG13 for alcohol use, violence, and sexual situations. It does NOT contain any nudity.
EDIT: The endings in the adult version are 'different' from the endings in the PG version (also the adult version has more endings). You can find the free adult version by doing a google search.
Take on the role of Arnie, who gets dumped by his girlfriend, and makes a wrong turn on his way home. Arnie subsequently encounters a mysterious female hitchhiker [Marcella] with a dark secret. This could be a night he'll never forget.
Can you solve the mystery and save Marcella from her horrible fate, or will Arnie meet his doom?
There are 5 alternate endings. The ending you get depends on choices you make in the game.
The PG 13 version is Windows only, playing time to reach any of the three 'main' endings is about 30 minutes.
The adults only version is cross-platform. You can find it at wolflore in the adult section (registration required).