There's a new special mission involving the usual Yatagarasu members, but Gai, Kei, and Nayuta are kept in the dark. The members go out of their way to keep this mission top-secret, but will they be able to keep the AIs out of the loop for long?
We'll do whatever it takes
to solve this mystery!
Koste es, was es wolle,
wir werden dieses Geheimnis lüften!
Desvelaremos el misterio sea como sea.
Desvelaremos el misterio sea como sea.
Vous pouvez être sûrs
qu’on percera ce mystère !
Risolveremo questo mistero, 
costi quel che costi!
Vamos desvendar este mistério,
custe o que custar!
Любой ценой разгадаем эту загадку!