庄敦大（铃木达央 配音）和片桐音（诹访彩花 配音）是从想一起长大的青梅竹马的玩伴，长大之后，两人之间单纯的友谊开始慢慢变质，最终，他们互相表白的心意，成为了男女朋友。
A former aristocratic family faces financial hardship and their daughter is introduced to a nice man in the auto repair business, the hope being that a marriage might be of economic assistance to the family. The daughter's family finds it hard to accept this kind of idea and the young man is uncomfortable with the difference in their social standing. However, everything works out in the end and a happy marriage takes place.
然而，困扰恩智的并不是两人之间的巨大差距，而是两人在接吻前三年停滞不前的距离。每当恩志想要采取任何进一步的行动时，他都被静雅温柔而含蓄地拒绝了。另一方面，静雅的母亲看不起这个普通的女婿，总是刁难。更让他心急如焚的是，突然归来的静雅青梅竹马是个富家公子，他似乎对静雅有些挥之不去的感情。K-1俱乐部部长成国（崔成国饰演）为了促进恩智和静雅的关系，计划为学校游泳队和K-1俱乐部进行夏季联合训练。一群精力充沛的男男女女在海边会发生什么滑稽浪漫的事情？
