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....
Mr. Natsuki and Ryuu-chan are duking it out!
!السيّد ناتسكي وريو-تشان يتشاجران
¡El profe Natsuki y Ryu
están teniendo un duelo!
¡El profe Natsuki y Ryu
están teniendo un duelo!
Natsuki et Ryû
sont en train de se disputer !
Il maestro Natsuki e Ryuu
O professor Natsuki
e o Ryu estão brigando!
Учитель Нацки и Рю
сражаются!