Its a good ending

In the end, haru offer rin his blood on the brink of his death and earlier that chief was talking about eating a mermaid's meat will make you immortal right? So i guess mermaid's blood does actually makes you immortal but it also comes with a curse. And that is it will turn you into a mermaid and you won't be able to live on land anymore. Thats why haru say sorry to rin at the end cause he didn't want to lose rin and he did it knowing how the outcome would be but yeah~ not that rin got anything to complain tho~ ヾ(❀╹◡╹)ﾉ~ srry my eng succ