Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.
ミレティス, the undersea country where mermaids live.
Originally a beautiful blue sea area, but now it is as black as darkness.
The protagonist is Princess Mermaid.
When she was a child, she was held in a tower for helping a human being.
Ten years later, her father, the king of mermaids, issued an order as a condition of freedom.
"Kill Basil Adelworth, the Prince of アルメリヤ, the Land of Men."
Instead of paying for her sins, she is given a job and released.
Don't get her hands dirty and live only in a cage for the rest of her life.
The mermaids went ashore to take away the lives they once saved.