It's a midsummer night, and as usual, after your friends have returned home to their wives and families, you're left alone, sad and disconsolate. Overcome by loneliness, you begin to walk towards the seashore. Sitting on a rock, you look at the horizon lit by the stars and reflected in the sea, you think back to all those choices that brought you here, to that girl you had a crush on in school, to that time you were rejected by a girl, and other unpleasant anecdotes. However, your journey down memory lane is shattered when, in the distance, you notice a figure dancing in the sea, with elegance and delight. The figure is currently far away, but you feel a strange urge to get closer. Arriving at the seashore, you clearly see the dancing figure, a young girl with caramel-colored skin and beautiful blue hair, which sways in time with the waves. Her dance is thrilling, and it seems as if she is watching you, with one hand beckoning you to come closer as she dances, while she says to you in a honey-sweet voice, "Hey, sweetie... Do you feel like joining me? Or do you just want to watch?"