Before his family left the town of Sakuranomori, Sana Hidaka said farewell to his five best friends, thinking that he would never see them again. Five years later, however, he finds himself returning to Sakuranomori to finish high school while living alone in an apartment owned by his parents. Can the threads of friendship severed by time be mended? Will his friends even recognize him? Or have the changes in their lives as they've grown from children to teenagers made them into different people, pushing them even further apart?
For Sana and his best bud Syusuke, it will be strange enough. But with Nanaka, Aoi, and Syusuke's twin Syuri all being girls, things are going to get even more complex. That's to say nothing of the sometimes-shocking secrets that his four friends know through having lived them, and that Sana will only discover in crossing the minefield of lost years. What once was can never be exactly as it was in treasured memories, but what could be may become even more precious as life moves inexorably forward.