Matataki convinces Umika and the others to start a school-sanctioned club to finance their rocketry endeavors. The next day, everyone in Umika's grade sets off on an overnight study camp.
That's because we were working in secret!
!هذا لأنّنا كنّا نعمل في قاعدتنا السّرّيّة
Es war schließlich ein Geheimnis!
¡Lo hacíamos en secreto!
¡Lo hemos llevado en secreto!
C’est notre activité secrète !
Perché abbiamo lavorato in gran segreto!
É porque estamos
fazendo escondido!
Так ведь мы втайне работали!