If your girlfriend says, "There's no last train, so I'll go home on the first train (crying)," it's a sign of cheating. I'm definitely cheating. This is because women are less at risk of going home in the morning than men due to their personal appearance. The reason for going home in the morning after committing it is one of the three major desires: appetite, sleep desire, and libido. Does she get drunk and go home in the morning to satisfy her appetite and sleep? *Bonus footage will be recorded after the main story ends.
