"The Next Person!!" (次なる一人!!, Tsuginaru Hitori!!, Viz: And One Makes Three!!) is chapter 348 of the original Naruto manga.
Suigetsu tries to convince Sasuke not to bother with Karin, but to no avail. They arrive at the prison Orochimaru left Karin in charge of and Sasuke asks her to team up with them. Karin refuses. Suigetsu leaves them to release the prisoners, but requests that they spread word of Orochimaru's defeat by Sasuke once they are free. While Suigetsu is gone, Karin is much more eager to work with Sasuke, suggesting leaving Suigetsu behind. She does not sway Sasuke by the time Suigetsu returns, but agrees to accompany them in going to find Jūgo.