Astel has watched Guest, a mermaid who appears in the sea, since he was a young boy.

Her singing under the moonlight. Her laughing with her kin. Her swimming gracefully through the ocean while remaining wary of humans.

Before he knew it, he was consumed by a single emotion: "I want her."

One stormy day, Astel heads to the sea alone and throws himself into the raging waves. He might die. He doesn't care. If only Guest would save him...

The plan has begun.

The story begins when Guest saves Astel and he wakes up on the shore. The moment he opens his eyes and sees Guest's face, he knows his plan has succeeded and smiles quietly.