Introduction:

Rumor has it that within the city of Milin, there exists an ancient castle. This castle is extremely peculiar—though some people are aware of its existence, no one can ever truly see it in their daily lives, except on the second day of July every ten years. It is said that the castle is filled with mirrors, and upon entering, one will immediately see a massive clock. Inside, there are butlers and servants, yet everything within appears to be meticulously arranged—so much so that everything exists in eerie, identical pairs. However, there is one exception. The master of the castle has never been seen.