Satougashi no Dangan wa Uchinukenai

Satougashi no Dangan wa Uchinukenai Summary:

The plot follows two girls and their summer in a rural area.
A new girl enters the high school of bored teenager Nagisa, before she knows it the new girl spends all her time following her around, and through the two’s communication, Nagisa finds out about mermaids and the truth about the town she lives in.