So a couple years ago I was read this manga, then I finished, because it was an incomplete series, but then I lost it.
Basically, what I remember is that there was this girl who wanted to join the army after she finished school to help support her mother, and she meets this very weird girl who thinks she is a mermaid and constantly drinks water out of a huge bottle. The girl has weird marks and bruises on her skin, but she brushes is off as "mermaid burns" or something else.
Then, a celebrity comes to the town, who was super famous and the army girl liked him a little bit. Some stuff happens, and then in the end, it turns out that the celebrity was the "mermaid girls" father and he was abusing her. The series finished after that.
Please help, it was a very sad manga!