When you're walking in the beach, you see a baby on a float. There is a board on the float, saying "Adopt me"

You got confused, why would a parent put their baby on a float? Why did they throw him out?

The baby is wearing a shark costume with his shark plushie The baby looks at you and wiggles his little hands

You decide to get into the water and pick the baby up to adopt it He has a paper inside his costume, he gives it to you. The paper is saying "Kurona Ranze aka Ranze"