Famitsu has a spread on Catherine that somewhat explains the action portion of the game. A scan of the magazine shows Vincent running away from monsters in his nightmares. You can see a better look of the heart creature here. Vincent has to climb a tower of stairs before the monster reaches him. If he falls off, players get a "Love is over" screen and Vincent dies.
The core story in Catherine is about a love triangle between Vincent, his long term girlfriend Katherine, and Catherine, the woman he had a one night stand with. During the day, Vincent drinks beers with three friends and each one has a different perspective on love. Orlando is a 32 year old divorcee who works with Vincent. After his divorce, Orlando lives a wild lifestyle. Johnny is also 32 and works at his dad’s used car dealership. He believes marriage is an event with your fated partner. Toby at 23 years old (lots of 3s and 2s) has had limited experience with women and love. He works with Johnny and thinks he’ll marry a girlfriend when he finds one.
In the game, Vincent and Catherine can exchange text messages and photo messages. A screenshot in Famitsu shows Catherine posing for a revealing picture.
Catherine comes out in Japan on PlayStation 3 and Xbox 360 this winter.