The moment the culture festival reached its finale, the jewel object made by Shirogane was stolen by a phantom thief who calls himself Arsène. Kaguya and the others headed to the roof where the phantom thief keeps appearing, but there was no one there. Fujiwara, who transformed into a genius detective, struggles to solve the mystery behind the calling card and uncover the thief's true identity. But Kaguya, left behind at the scene of the crime, had begun to figure out the criminal. The problem is the location. Kaguya traced the phantom thief's line of thinking and headed to where he is now...
All I did was give the keyhole called "mystery"
the slightest of turns.
.كلّ ما فعلته هو إدارة ثقب المفتاح المدعو باللغز قليلًا فقط
„Ich habe bloß den Schlüssel zu diesem Rätsel
ein klein wenig im Schlüsselloch gedreht.“
"Simplemente giré un poco
la llave en la cerradura".
"Simplemente he girado un poco
la llave en la cerradura".
Je n’ai fait qu’ouvrir un peu
la serrure appelée énigme.
"Io ho soltanto girato un po' il meccanismo 
nella serratura di questo mistero"
"Apenas girei um pouco a chave
na fechadura chamada mistério."
Я просто чуть повернула ключ в замке, 
что называется загадкой.