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.
going off on your own to 
freshen up at the hot spring.
تذهبين بمفردكِ للانتعاش في النّبع السّاخن
Lässt es dir einfach allein in
aller Seelenruhe im Onsen gutgehen.
Partiste a bañarte
a las aguas termales tú sola.
Fuiste a bañarte
a las aguas termales tú sola.
Ça se fait pas
de te délasser seule aux bains.
te ne sei andata da sola a goderti le terme.
Não acredito que foi sozinha às termas.
Уехала одна на источники
и распарилась от души.