ok, this is kinda late so i'll write from what i remember. it is a month after the fierce battle with aizen, gin, tosen and the espada. old man yama has lost his left arm in the battle in the world of the living, and is now reading the riot act the kuraku, kenpachi, and bayakuya about losing their captain's coats in their respective battles. meanwhile aizen who we see in the beginning of the manga all bound up is when it is all said and done sentenced 20,000 years in the lowest prison in the sereti. (if you ask me, immortal or not. they should their best to kill him) around the same time mayuri is in hueco mundo, toshiro is trying to improve