Nagi No Asukara Temporada 1 Episódio 18

With Mihashis 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 its the first time that Miuna has come to the sea village.