A manager who lives on Tarev Island, an island full of mysteries. She is in charge of managing the resort located on the island. Apparently, she has been living alone ever since she lost her family in a storm. Now Lethe lives and defends the Tarev Island by herself along the help of sea monsters and her Oceanic Greatsword, Lethe also doesn't want being touched and always has a Tanned skin, due to her always outside and always wearing a swimsuit everyday