Nagi-Asu: A Lull in the Sea Season 1 Episode 18

With Mihashi’s lead on how to get into Shioshishio, Hikari, Kaname and Miuna go to investigate. They follow the sound of sand flowing that Miuna keeps hearing and land in Shioshishio, which is covered in snow. Hikari and Kaname find it nostalgic, but it’s the first time that Miuna has come to the sea village.