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 knew that Minamo's swimsuit from 
middle school would fit you perfectly.
عرفتُ بأنّ زي سباحة مينامو من المدرسة
الإعداديّة سيليق بكِ بشكل مثاليّ
Wusste ich’s doch!
Sabía que el bikini de secundaria
de Minamo te serviría.
Sabía que el bañador de secundaria
de Minamo te serviría.
Minamo avait vu juste,
en te prêtant son maillot du collège.
Il costume di quando Minamo 
 era alle medie è della taglia giusta.
O biquíni do ensino fundamental da
Minamo ficou certinho mesmo, né?
Этот купальник Минамо
ещё в средней школе носила!