However, the Emperor Komei showed his unpleasant feelings about the growing power of the Sonno Joi party, and thereby Imperial Prince Kuninomiya Asahiko of kobu-gattai (integration of the imperial court and the shogunate) and others forced through the Coup of August 18, jointly with Katamori MATSUDAIRA of Kyoto Shoshidai (local governor of Kyoto) and the Satsuma clan.
しかし、尊攘派の増長に孝明天皇は不快感を表し、公武合体派の久邇宮朝彦親王らは、京都所司代松平容保および薩摩藩と組んで八月十八日の政変を強行。