Banba agrees to work for Saruhiko labs.  He's invited to their lowest level, where the cause of all the incidents is revealed. Then it gets loose...
You don't need to hide it.
لا داعي لإخفاء الأمر
Du musst es nicht verstecken.
No te hagas el tonto.
No te hagas el tonto.
Pas la peine de faire l’ignorant.
Non c'è più bisogno 
 di nascondere le proprie carte.
Não é preciso fazer cerimônia.