Ao to Umibe no Nostalgia

Ao to Umibe no Nostalgia summary:

A great summer storm has just passed through a small town by the sea. On the silver sands beneath the high azure sky lay scattered the debris washed ashore the previous night. And there is also a surprise awaiting the group of friends gathering curious objects there – a young girl named Chouko. She is local and even though she is not sure what happened to her, she remembers the little sleepy town very well… the way it was over eighty years ago.