There is another type of monster, similar to Mariko and Takahashi Fumihiko. These count as the second type. They lurk because they wish to absorb more desire. Monsters that lurk are almost indistinguishable from real people.
It's very hard to tell through a peephole. These monsters often won't tempt you to open the door... But according to the rules, your house indeed needs to have someone in it.
So you must open the door for someone, at least for someone who looks like a person through the peephole.
After they enter the house, they start to exert their power, creating all sorts of strange phenomena to make you realize they're not human and deny them, thus ending their lurking period ahead of time.
Of course, the main reason for ending the lurking period early is still... you're too difficult to deal with.
After they enter the house, they find nothing on you that they desire. For example, lust, fear...
So they want to end the lurking period ahead of time.
