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....
I can't imagine she held onto 
her just because she was rare.
لا أتصوّر بأنّها احتفظتْ بها فقط
لأنّها كانت نادرة
Doch nicht nur, weil sie selten ist …
Dudo que fuera solo por ser inusual.
Dudo que fuera solo por ser inusual.
Elle valait pourtant
une petite somme.
Dubito lo facesse solo perché è rara.
Não consigo me convencer
de que foi porque ela é rara.
Просто потому что она редкая?