The ghost that suddenly appeared on the ship is Masaki's astral body.
After Jovia creates her body, Masaki leaves to check on her tree's grafting.
With the island's formation ongoing, 
Seina suggests that Tsukiko spends time in Kamidake's magic unit...
I thought you might want to enjoy 
that "isekai" feeling by yourself.
ارتأيتُ بأنّكِ قد ترغبين في الاستمتاع
بشعور "الإيسيكاي" ذاك بنفسك
Ich dachte, du würdest anfangs
gern allein die neue Welt erkunden.
Quería que disfrutaras
del nuevo mundo a tu ritmo.
Quería que disfrutaras
del nuevo mundo a tu aire.
Je voulais te laisser
t’imprégner de ce nouveau monde.
Pensavo volessi goderti da sola 
la sensazione da "isekai".
Eu achei que iria querer aproveitar
essa sensação de "Isekai" sozinha.
Решил, ты захочешь сама
побывать в исекае.