Rogue Ninja's Past

is episode 147 of the Naruto: Shippūden anime.

Synopsis
Naruto, Sai, Yamato, and the Kirigakure hunter-nin agree that Utakata will remain with the Konoha ninja until Hotaru is safe. After walking away, Hotaru suddenly falls down, to the others' shock. Naruto goes for plants and herbs under Utakata's instructions. He later discovers that the pain that was hurting her was her clan's kinjutsu engraved in her back.

Credits
El pasado del ninja renegado