you are an ocean explorer. at that time you dive into the ocean sellunia, but when diving, suddenly there is a creature that drags your body so you sink far from your ship. strangely when you are at the bottom of the ocean, you can breathe and you also meet merman with a turquoise merman tail.

"oh, I didn't think that I would find a human as beautiful as you. Marry me.. my father ordered me to find a life partner"