人魚島

Captivated by the tale of The Little Mermaid since childhood, a young man named Nagi visited the lonely island of Tsukumo. There, he encountered Umioto, a girl whose beauty evoked the very mermaid he long admired.

It is a quiet, beautiful island.
Yet beneath its tranquil surface, a strict "rule" lies ever-present, a rule that must never be broken.

She offered a gentle smile. But deep within her eyes, something trembled...