Seta went for his excavations as usual and left Sara in Hinata Inn under the care to Keitaro. Sara messes up Naru’s room, upsetting Naru. However, the Hinata girls find Sara very adorable. Naru and Seta meet eventually.

Naru fell in love with Seta when Seta is tutoring her. Knowing that, Keitaro encourages Naru to confess to Seta. Everyone, including the Hinata girls went into the cave.  With Keitaro and Sara's help, Seta found an entrance to the land of the turtle civilisation in that cave.

However, it is no ancient turtle civilisation. Kaolla’s mechanical eggs laid lots of mechanical turtles there, and they start to switch to attacking mode.

Motoko used her impressive skills to sweep away those mechanical turtles. Unfortunately, the impact also causes the ceiling to collapse, trapping them in the cave.

Keitaro announced to Seta that Naru likes him. Naru looks at Seta in embarrassment as Seta confesses that he likes Naru too. To Naru’s dismay, Seta also announces that he like Keitaro.

Luckily, they are found by Haruka and later saved.

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