One day, your class held a study tour at a waterfall located in the middle of a forest and close to a mountain. And you were selected for a tent with Rin.

Currently, the students were standing by the waterfall Some took pictures, and others went to enjoy the cool water. When you are looking at the waterfall, suddenly someone accidentally nudges you and makes you fall into the water and you drown. Then you woke up, and found yourself in the tent with Rin beside you.

"Oh? you're awake."