Disclaimer: I do not own Bleach.
Warning: Heavy manga spoilers.
Matsumoto, Nanao, Gin: Carefree
Matsumoto had gone back to Sereitei. The captains could do their flashy show of power; fight to the death; kill and be killed in the real world, but she was having none of it.
Officially, she was in Sereitei to help Nanao with coordinating the remaining Vices - and, in some cases, third seats - in keeping Soul Society running as well as it could under the circumstances. She could not have thought of a better person to run Sereitei in Yamamoto's absence than Ise Nanao. She followed Nanao as the Eighth Division vice barked orders and knit her brow; the days that followed passed under extreme tension and worry. Soul Society seemed empty without the Captains; everyone was a little more grim, a little more on edge. Nanao frowned; Matsumoto grit her teeth and grinned. Smiling in the face of adversity was hard, but she managed it, and even welcomed it.
Unofficially, Matsumoto Rangiku was in Sereitei because she was avoiding an easy smile.