The sea's will - Nagi no Asukara

After Manaka moved away from Shioshishio, Hikari has been acting very off. She disappeared without saying why, or where she was going. Kaname, Sayu, Chisaki and Tsumugu all moved on, but Miuna breaks every time she sees Hikari acting odd again. She knows Hikari still loves Manaka. She knows how much he misses her, but...