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....
That little one... Is that the Humanoid 
you brought here to sell before?
هذه الصّغيرة... هل هي البشريّة الآليّة
الّتي أحضرتها إلى هنا لبيعها من قبل؟
Die Kleine da …
¿Esa pequeña es la humanoide
que vinieron a venderme?
¿Esa pequeña es la humanoide
que vinisteis a venderme?
La demi-portion, là…
Quella piccoletta...
Essa tampinha aí... por acaso é a humanoide
que você trouxe para vender aquele dia?
Эта девчонка…
ยัยคนตัวเล็กนั่น