The life of the girl Sia is about to change - a new city, a new school, new friends... But fate has its own plans! Sia meets a mysterious cat with different colored eyes: one is purple, the other is golden. Following him, the girl dives into a hole, like Alice, and finds herself in another world. Magical. So it seems at first glance... Until Sia realizes that the cat has led her into the most terrible trap - a restaurant of monsters! Eat even a piece of food here, and your heart will become moldy and stop. The owner of the restaurant is looking for a heart that will help cure a terrible disease. And so Sia, having miraculously avoided impending death, enters into an agreement to work for a month in a restaurant and find a cure...Will the girl be able to return home or will she have to give up her heart?