Two of Nana's classmates play a Ouija-style game after school and find themselves in supernatural trouble. The head of a competing agency shows up to deal with the problem, but has another objective in mind involving Muhyo & Roji's bureau.
More precisely, it was
two days at the magic prison,
،لأكون أكثر دقّة، أمضينا يومين بالسجن السحري
Wir waren zwei Tage im Magiegefängnis
und fünf Tage bei der Gesellschaft.
Deux jours à la prison
et cinq jours à l’Asso, en vrai.
Per la precisione, sono stati 
due giorni nella prigione magica,
Ну, в тюрьме только два дня,
а пять — в Ассоциации.