Spring, the season of encounters and partings. It's spring break, and Sakawa Haruki is about to go into 3rd grade.
His childhood friend group includes: Kuriyama Tomari, Tokorozawa Iku, and Sugou Chisato. 2 new girls just joined the group: Harunohara Yuuna, who lives in the next town over, and Nishitani Shizuru, who just moved into the neighborhood.
Ironically, at the same time these 2 girls joined, Haruki had to move away from home and his childhood friends.
During spring many years later, Haruki's father gets transferred to work overseas. Haruki decides to stay in Japan to concentrate on university entrance exams, and ends up living in an apartment owned by a relative. This apartment happens to be in the same town where he parted from his childhood friends.
Thus, the rails of fate cause Haruki and his childhood friends to meet once again.
Haruki was worried that the girls wouldn't accept him in the group like they did in the past, but despite the long gap, they were happy to see him and welcomed him back warmly. However, the fact that these girls have grown into beautiful women has caused Haruki to feel more embarrassed than happy.
As they reminisce about the past, filling in the blanks between the time they parted, he'll get to know them and perhaps enter into a relationship with one of them...