讲述女主角高桥七美在校园中与诗野原晴的恋爱故事。高桥七美是高一的新生，也怀揣着15岁少女的心态，冒失地闯入了新学期的交友之中，很想插入大家的话题，却无法了解众多人口中的事件。在众多女生交谈之中，也发现了备受瞩目的焦点是矢野元晴。高桥七美在班委推选之上，被矢野元晴无意耍了一道，也是此事作为契机，两个人很快就有了交集。矢野元晴隐藏起来的烦恼很快被高桥七美所察觉，也迎来了人生最大的失算，喜欢也是如此的意外。高桥七美也并没有意识到自己喜欢上了矢野元晴，在某天触及到矢野元晴的过去，了解到名叫奈奈的女生是矢野元晴的女朋友。奈奈也是自己的同班同学，在前一年夏天与朋友兜风时去世于车祸，在了解到矢野元晴过去，高桥七美仍是想要表达自己的心意追求矢野元晴。

It tells the love story between the heroine Takahashi Nanami and Shinohara Haru on campus. Takahashi Nanami is a freshman in high school. With the mentality of a 15-year-old girl, she recklessly breaks into the new semester's friendship, and wants to insert everyone's topic. But unable to understand the events in the population. Among the conversations of many girls, it was also discovered that the focus of attention was Yano Motoharu. Takahashi Nanami was selected by the class committee, and Yano Motoharu unintentionally tricked her . Yano Motoharu's hidden troubles were quickly noticed by Takahashi Nanami, and she also ushered in the biggest miscalculation in her life, and the same was true for her love. Takahashi Nanami also didn't realize that she fell in love with Yano Motoharu. One day, she touched Yano Motoharu's past and learned that a girl named Nana was Yano Motoharu's girlfriend. Nana is also her classmate, who died in a car accident while driving with her friends the previous summer. After learning about Yano Motoharu's past, Takahashi Nanami still wants to express her heart and pursue Yano Motoharu.