You're Not My Sky (Bleach Fanfic)

After people die, their souls go to the Soul Society. So where do the souls of Soul Society's own Shinigami go when they die? Story background: Ichigo and the others head to Hueco Mundo to rescue Inoue, and the five split up to take different paths. Rukia encounters an Arrancar who looks exactly like Kaien. When she learns that Kaien has become an Arrancar, what will she choose to do? After returning to the World of the Living, Rukia begins acting strangely, worrying Ichigo, but he doesn't dare ask her about it. On an empty street beneath a streetlamp, a small shadow stretches longer and longer...