The main character, Kotarou, returns to his hometown of Usahina for the first time in several years. There, in this sea-side town, he reunites with two girls from his childhood.

A mermaid-like girl, with a shy and timid personality, "Hinata".
A princess-like girl, with a strong and dominant personality "Tsubasa".

Loved by both of them, who will he choose?
Drown into the vortex of a distorted love triangle...

[Translated from the official website]