They had known each other since they were children and separated when they were seven years old. Ten years later, they returned, losing their childishness and putting on mature faces. When they met again, there was an extra girl beside them; they passed by each other, and even though they still knew them, they had already forgotten them. The three of them swore that they would remember them no matter what, and look at their surprised expressions, but the reality was always so unsatisfactory, and the three girls always prevented them from recognizing each other. What sparks will fly when six girls meet? Can they be together?