In Kinoshita Akari: Overlapping Feelings, the characters decide to go swimming in the sea on their day off. So, you, the hero, head off in a boat with another character named Akari. You both notice a nearby cave and end up heading over to see what it is like. Suddenly you are in a bit of trouble and problems ensue. You are stuck there and have to stay all night in this cave. And now as the evening goes forward, you and Akari start to have feelings for each other.