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....
COMPANY: NOJIMA PRECISION MACHINERY 
FACTORY NO. 1
الشّركة: نوجيما للآلات الدّقيقة 
المصنع رقم 1
Werkstatt Nr. 1
Maquinaria de precisión Nojima
Fábrica 1
Maquinaria de precisión Nojima
Fábrica 1
OUTILLAGE NOJIMA
BÂTIMENT Nº 1
Macchinari di precisione Nojima
    Fabbrica n° 1
Fábrica 1
Машиностроение Нодзима
Завод №1