Umi to yuuhi to kanojo no namida sutoroberi firuzu

The setting is the town of Tanabe in the central prefecture of Wakayama. Four schoolgirls are fast friends. However, when Risa, Mika and Maki die in a car accident Natsumi is alone, isolated and listless both at school and socially. When the three friends return, however, Natsumi is alone no longer.