~4th Great Ninja War~
The war was about to end. After one of the final battles Natsu started feeling really weak. She wasn't sent as a medic-nin but with the close range group. She didn't mind it and keep on going anyway, she had to catch with her team.
Her vision started to fade and ended up passing out. She hit her head with the ground really hard.
It was Raiga who found her half an hour later. He knows nothing about first aids besides the little Natsu thaught him. Still did what he could until she woke up.
Alone with a half dead partner Raiga had to make it back to the camp where a group of medics took care of her.