Shima o Tansaku (E07)

To prepare for the possibility of their cast-away life lasting longer than they thought, Homare and the others decide to explore the island, and they spot, of all things, a house! With hopes of rescue rising in their hearts, they race forward, but what they discover is the ruins of an abandoned building... Noting the despair of the other girls, Homare finds an item they'll need to survive the island! (Crunchyroll)