Seiji is holding a treasure hunt for New Year's, and of course, Aoi and Kiyotaka are attending. But while the rest of the guests struggle to decipher the clues, a sudden party-crasher arrives...
Whoever finds the key will receive both it
 and a present from my grandfather.
.أيٌّ من يجد المفتاح سيأخذه وهديّة من جدّي أيضًا
Wer ihn redlich gefunden hat,
erhält den goldenen Schlüssel
Quien la encuentre
Quien la encuentre
La personne qui trouvera la clé
Chiunque troverà la chiave
Quem encontrar a chave receberá
isto e um presente do meu avô.
Тот, кто найдёт ключ, получит 
и этот ключ, и подарок от моего дедушки.