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....
She's complimenting me so why 
do I feel so unpleasant?
إنّها تمدحني، لكن لماذا أشعر بالاستياء؟
Keine Ahnung, wieso, aber irgendwie hat
das Lob so einen schlechten Beigeschmack.
¿Por qué no me complacen
esos cumplidos?
¿Por qué no me complacen esos cumplidos?
Vos compliments froissent mon ego,
pour une raison que j’ignore.
Perché ho la sensazione che ci sia qualcosa 
di poco lusinghiero in questi complimenti?
Se estão me elogiando, por que será que
estou me sentindo tão desconfortável?
И почему мне обидно слышать
вашу похвалу?
กำลังถูกชมอยู่แท้ๆ
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