Childhood friends Aoi Satsuki and Arata Uzuki are tasked with producing a fan event as part of a TsukiRadi project. Aoi, the considerate and kind prince of Gravi, selects "adventure" as the event's theme.

Believing adventurousness to be something he lacks, Aoi works extra hard to come up with an event concept with Arata. The answer they arrive at is a puzzle/escape room at the zoo that will give guests a taste of the extraordinary. The younger members take on the role of the guests as they begin rehearsing for the event!
Now that you mention it, 
Alan hasn't come back yet.
بالفعل، لم يعُد ألان بعد
Stimmt. Alan ist nicht
mehr zurückgekommen.
Es cierto. Alan no ha vuelto.
Es cierto. Alan no ha vuelto.
Tiens, il n’est pas revenu.
In effetti, Alan non è ancora tornato.
Pensando agora, Alan ainda não voltou.
А ведь он прав, Алан так и не вернулся.