Sasami

is an unknown assailant.

Jūgo Arc
Sasami and Momo confronted and prevented Team 15 from requesting backup from Konoha. They managed to immobilise Namida Suzumeno and Wasabi Izuno by using the opportunity to test their device based cursed seals while Sumire Kakei reluctantly escaped with Nue. They later disguised themselves as researchers from the Land of Rivers and brought Namida and Wasabi, both infected with the cursed seal, back to the village, informing Team 7 that they only found the two members of Team 15 unconscious but did not find Sumire.