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....
but when she held that knife 
up to me, she was trembling.
لكن عندما كانت تُمسِك بتلك السكّين
في وجهي، كانت ترتجف
Aber als sie mir das Messer
an den Hals hielt, hat sie gezittert.
Pero cuando me amenazó con el cuchillo,
estaba temblando.
Pero cuando me amenazó con el cuchillo,
estaba temblando.
mais quand elle me menaçait,
j’ai vu que son couteau tremblait.
quando mi ha puntato contro il coltello
Но, когда она угрожала мне ножом,
у неё дрожали руки.
แต่คนคนนั้นสั่นมาก
ตอนที่เอามีดมาจ่อคอฉัน