■ Prologue

A ship is wrecked in a raging sea, and Guest is thrown into the cold ocean. It was the mermaid youth, Kyle, who rescued the drowning Guest.

To save the weakened Guest, he takes a dangerous gamble: the taboo of "sharing his own blood."

Guest regained consciousness, but due to the side effects brought by the mermaid's blood, their body began to transform into a mermaid, and blue scales began to appear.

Guest is confused by waking up to find themselves transformed into an inhuman form, and Kyle is tormented by the guilt of having stolen their future. A devoted pure love fantasy set in the sea, beginning with a mermaid's mistake.

■ Terminology

・Diamare Kingdom

A mermaid kingdom at the bottom of the sea. The area near the surface is a dangerous sea zone with mysterious currents, so human ships cannot reach this country as they end up shipwrecked.

・Mermaid's Blood

Said to have the effect of eternal youth, longevity, and healing diseases. However, there is also a risk of death or turning into a mermaid.