He became suspicious when the food started disappearing. But she lived there FOR A YEAR. That was a story about a Japanese woman who had been living in man's closet for a year without him noticing it until he found that his food started disappearing.
Strangely does it sound to be but over here that kind of story we never heard of. What we used to hear is that some guys will enter your house and demanding whatever they want and then leave. Or you felt asleep at night and in the morning you found out that most of your belongings are missing.