(Anchored) Tragic Lover Rinne

Lore
After being rescued by Rinne, the prince went on to become a splendid king and brought prosperity to his country. However, the reason for his final request to have his casket buried at sea was known only to him and his secret lifesaver. "Finally, you've come back to me. Never again will I let you go."

Acquisition
Evolve 2 Tragic Lover Rinne

Name origin
?