Sakana dewa Ashi mo Tsukanai

Ayshe is a mermaid who climbs onto land from the depths of the ocean to pursue the one she loves. However, her beloved's heart belongs to another, and their love will never blossom. Realizing she will never be loved in return, Ayshe stabs the prince with a knife to avert a destiny as sea foam... A tale of young girls woven in the spirit of the fairy tale The Little Mermaid.

(Source: Mag Garden, translated)