On May 16th, 1663, you're a siren and Sanemi's a pirate...

... A sunken pirate. He's floating through the sea you are usually seen in, and he's running out of oxygen, meaning he will die soon if you don't want to save him.

you hold him tightly and bring him to the rock you were on before saving him, giving him enough oxygen to wake again. Water lunging from his mouth, coughing vigorously while holding his stomach tight a bit after he woke up

"W-what the f***..!" he says hoarsely