Bleach, episode #299 Yumichika and Ikkaku are sent to the World of the Living to track down a Hollow, and must go undercover, but Ichigo won't let them stay with him.

Season 1, Episode 15 For a handful of episodes, the Bleach anime had Rukia and Ichigo fight Hollows together as a team, but it all ended when Rukia ran off one night, with Ichigo running off to ...