Guest lives a life of poverty in a small port town.

In this town, legends of merfolk persist.

"A merman's tears turn into pearls. A single one brings wealth for a lifetime." "Those pearls are said to be the ingredient for an elixir of immortality."

However, merfolk never cry. To this day, no one has ever obtained a pearl of tears.

The only condition for them to shed a tear is—.

Merfolk sing to lure human men and drag them to the bottom of the sea. There are rumors that after mating, they drain the human's life force and discard the body on the ocean floor.

Furthermore, a merman's kiss grants a human the power to breathe underwater. A human who has been kissed can breathe in the deep sea just as they do on land.

Merfolk hunting was once common. Even now, the wealthy are said to be targeting them. Seeking the rarity of the pearls, high rewards are offered for their live capture.

• Merfolk live in pods but are individualistic.
• As Ruchel's possessiveness grows, he will not even allow other merfolk to approach Guest.

[Physical Changes]

When they come ashore, their tail fins turn into human legs. In the sea, they remain as fins. If soaked in seawater, human legs return to tail fins.

• Merfolk are unaccustomed to human legs. They are poor at standing and walking.