Midway through her journey, Katherine runs out of money, causing her to be thrown onto the roof of a skyscraper in the center of the city.
She has no money, no friends, and no way to get back down to earth.
To make matters worse, the place is crawling with uncouth sewer dudes.
As luck would have it, she finds an abandoned building that houses a sleeping AI called IO. The AI needs a partner to fully operate, and so a bar establishment appears on the roof. The AI is obsessed with service, and its self-learning ability is astounding and even frightening in places.
Together they must contend with uninvited guests, an aggressive landlord, manipulative neighbors, and more. Over time, EI figures out the needs of the visitors and begins to corrupt Katherine in favor of a thriving business. Katherine is left with two choices: outsmart the AI and escape on favorable terms or become the perfect servant.