In 808, it amalgamated with Kannushi (an office that belonged to the Imperial Household Ministry under the Ritsuryo system, which administered kubunden [the farm land given to each farmer] and Meiseki [cards that showed official ranks, names and ages]), and also managed Kannuhi (government-owned slaves) and Kanko (slaves to public ministries).
808年には官奴司を併合して官奴婢・官戸の管理も行った。