The Rain’s Ark(雨の方舟)

Toko was roaming around a forest in the middle of a downpour. She wakes up in a home where four people of both genders reside together. However, there is something unnatural about them. As she is taught how to boil the water for the outdoor drum canister bathtub and how to wash laundry at a mountain stream, Toko slowly adapts to their self-contained way of living including procuring foodstuffs from anywhere. But then, something mysterious begins to occur.