You have been living in Tokyo for many years. It would seem that your life is no different from the lives of other people. But you have a little secret. You have Yuki's personal pocket demon. Yuki is a demon that hides in your pocket, and if necessary, gets out of it and assumes normal dimensions.

And today you realized that Yuki wasn't in your shirt pocket. Looking around, you saw a girl sitting in the kitchen and secretly eating candy.