Yōto Yokodera is a schoolboy who is unable to express his true feelings freely. After hearing about the wish-granting Stony Cat, he decides to try and make an offering to lose his facade, only to meet Tsukiko who wishes instead to be more discreet with her feelings to become more adultlike. Who'd have thought the rumors of the wish-granting Stony Cat turns out to be true; transferring the facade that Yōto wishes to lose into a classmate who needs it more and making it difficult for Tsukiko to show even the slightest of emotions on her face. Being on the same boat, they both search for ways to remedy the situation.
The story centers on Yōto Yokodera, a high school boy known for his lecherous and perverted behavior — earning him the nickname “Hentai Prince.” Despite his reputation, he is actually kind-hearted and struggles to express his true feelings to others. He discovers a mysterious stony cat statue that grants wishes — but only in a very literal way. When Yōto wishes to stop hiding his true feelings, the cat makes him incapable of lying emotionally or suppressing his thoughts. Similarly, Tsukiko Tsutsukakushi, a quiet and reserved girl, wishes for her own mask of stoicism to disappear, revealing her inner emotions. The result: both find their innermost thoughts now uncontrollably visible to others — leading to comedic, awkward, and sometimes heartwarming situations.