Finally, construction on the secret hideout begins! When Serufu invites Purin to build it with them, Purin’s secret is revealed. Together, the club members work through rainy days and sunny ones while their summer vacation deadline draws nearer.
As we approach the completion 
of our secret hideout...
...بينما نقترب من إكمال مخبئنا السّرّيّ
Auf, zur Vollendung
unseres Geheimverstecks!
Estamos a punto de acabar
nuestro escondite secreto.
Estamos a punto de acabar
nuestro escondite secreto.
On va achever la base secrète !
Ci avviciniamo al completamento
del nascondiglio segreto...
Vamos manter os trabalhos para
terminar nosso esconderijo secreto...
Завершение нашей
секретной базы уже близко.