Reincarnated In The Magic World Called Gaia
The proffesional assassin, Kiara Aurano, was sent on a mission. Unfortunately, the ship she's riding on, suddenly had an explosion causing the ship to sink. She died AFTER saving a young girl. Yeeessss... she died. The thing is, she drowned. Despite knowing how to swim. How? You find out.
Anyway, she thought that was the end, but suddenly she found herself in a white space with a chair like throne infront of her. And on this chair--- I mean throne sat the goddess of death...
"I'M SO SOORRRYYYY!!! You weren't suppose to die today. So in exchange... I'll let you live again. In another world. So bye-bye!"