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In the suburbs of Tokyo, a group of six girls have played together at the park since they were little, but eventually have to switch schools. Before they leave, they plan to make a time capsule, but are unable to do so. The story follows the girls four years later as they meet again.
 
                    

 
                            


 
                                     
                                     
                                     
                                     
                                     
                                     
                                     
                                     
                                     
                                     
                                    