Nagi-Asu: A Lull in the Sea S01 E22 Something Lost

Tsumugu talks about Uroko-sama and ends up with the curse fish on his arm. This makes Hikari and the others realize that Uroko-sama is not in the sea, but on land. To find out what's going on with everyone in Shioshishio, what's going to happen to the surface, and about Manaka who's lost her Ena, everyone looks for Uroko-sama.