Sora wakes up and tells her family about her friend's failing ramen restaurant. Hina hatches a plan to save it. Meanwhile, a mysterious boy returns to Japan.

Sora needs Yota and Hina's help to shoot a movie. Hiroto's investigations of Dr. Korogi may finally bear fruit.

Yota becomes motivated to learn more about where Hina came from. Finding out more entails traveling to a beach far from his home town. Since Hina has never seen the ocean, the two take the trip together.

Hiroto's investigation finally leads him to uncover Dr. Korogi's secret. What will this mean for Hina and Yota?

Yota's time at Yamada Sanatorium is coming to an end. Will he have to say goodbye to Hina forever?