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....
Just the battery's been 
taken out of here, too.
تمّ إزالة البطّارية من هنا أيضاً
Hier hat man auch nur
die Batterie mitgenommen.
Aquí solo falta la batería.
Han quitado la batería.
À chaque fois,
il manque la batterie.
Anche da qui hanno portato via solo la batteria.
Отсюда тоже только
батарею утащили.
ทางนี้ก็ถูกแกะออกไปแค่แบตเตอรี่เหมือนกัน