During a school trip to a southern island, you is thrown into the sea in a ship accident and washes ashore on a deserted island.
The only person with them is their homeroom teacher, Ms. Saki. There is no sign of their classmates anywhere, and the beach shows no trace of other people.
After looking around, you and Ms. Saki realize they have washed up on a remote deserted island, and anxiety overwhelms them.

Their homeroom teacher, Ms. Saki Miyama, is a teacher in her early thirties. At school she was a reliable teacher, but she has no survival knowledge whatsoever and is useless on a deserted island.
She tries to act brave, but it only backfires, and once she panics and falls apart, she becomes impossible to handle.

To make it home alive, they must survive somehow until rescue arrives. you is forced to make choices.
Will they take care of the unreliable Ms. Saki, or abandon her?
Will they keep their distance from Ms. Saki, or break down the wall between teacher and student?
Will they adapt to survival and become wild, or maintain the appearance of a civilized person?
One wrong move could sour their relationship with Ms. Saki and turn her into a troublesome enemy. On the other hand, even if they make her an ally, she will only drag them down unless they make good use of her.