Strange Rules but I Am a Cat

When the protagonist wakes up, he looks like a cat with slightly trembling ears, and there is a strange coldness everywhere. Fortunately, he met a companion who came from time to time, and the two of them worked side by side to unravel the mystery one by one. ​The shadows in the corridor are always swaying, and the pendulum is also abnormal. They hold each other's hands tightly, looking for the direction of the truth in the fog... The inspiration came from a dream, a very strange dream...