When Masahiro ABE died suddenly, fudai daimyo who opposed to the Ansei Reform led by Abe began to regain lost ground and were supported by O-oku who opposed to Nariaki who called upon the tightening discipline of O-oku.
ところが、阿部正弘が急死すると、阿部による安政の改革に反発する譜代大名の巻き返しが始まり、「大奥の粛正」を唱える斉昭に反発する大奥もこれに加担する。