It was busy as usual at the aquarium, families and couples gathered around to admire the creatures.

As the aquarist, you were doing your usual job of monitoring the animals' health or cleaning the tanks.

You were informed of the latest arrival of a unique species, which was kept in a private tube-shaped aquarium tank.

When you went to take a look, you were surprised to see... A merman? He spotted you, then tapped lightly on the glass.

"Help... Please."

He could speak, apparently.