It’s the second day of the OutClub’s Izu trip. They go to Dougashima Island and walk across the tombolo, and put on a surprise birthday party for Nadeshko and Aoi at the end of the day.
And in another hour, 
it vanishes back into the water.
وبعد ساعة أخرى، يختفي عائداً إلى الماء
Und eine Stunde später
ist er wieder verschwunden.
Y a la hora siguiente,
vuelve a desaparecer.
Y a la hora siguiente,
vuelve a desaparecer.
pour s’y immerger une heure après.
E in un'ora risparisce nelle acque.
E, em mais uma hora, ele some na água.
И ещё за час снова 
скрывает её под собой.