After his parents died, Shinpei Ajiro lived with the Kofune sisters, Mio and Ushio, but he has since moved to live on his own in Tokyo. But after Ushio drowns while trying to save the young Shiori Kobayakawa, he returns home to mourn her departure. However, bruises around Ushio's neck bring her cause of death into question.

Taking a step back, Shinpei becomes convinced there must be another explanation. Dangerous entities roam among the islanders, and a vision of deceased Ushio asks him to "save Mio" as her final request. He is certain that something is afoot—and Ushio's death is only a piece of the puzzle.
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Episode 1:

Alright, let's gooooooooooooooooooo. Dat end lol

I've tried watching tonally similar shows before, but the thing that always made me quickly drop it was the character designs that I disliked. This anime has sympathetic, likeable character designs and it makes all the difference.

As for the story, it's intriguing. Maybe a little too many construed mystery scenes, but that's to be expected. My expectation is a nice, little island mystery with some neat twists. And that's fine.