Natsuki sets his heart on creating a tidal power generator that utilizes the ebb and flow of the ocean's tides. He dives back into the ocean to find some materials and salvages some resin from the ruins of Ryuuji's family's factory. As soon as he gets back he gets to work. As they are working, Natsuki and Ryuuji exchange heated opinions over how the generator should be built. Atri intervenes and the two guys become closer friends. Meanwhile, a suspicious-looking character peeks at them from outside of the school....
Wow, I guess there really 
aren't any anywhere.
عجيب، أعتقد لا يوجد بطّاريات
في أي مكان أيضاً
Hach, es gibt hier
wirklich nirgendwo welche!
Era verdad que ya no queda ni una.
Era verdad que ya no queda ni una.
Oh non !
Il n’en reste vraiment plus une seule ?
Uau, parece que não tem
em lugar nenhum mesmo, né?
Ну и ну… Совсем нигде не найти?