On July 13, 1864, Shinsengumi (a group who guarded Kyoto during the end of Tokugawa Shogunate) received an order from the bakufu (Japanese feudal government headed by a shogun) to arrest the remnants of those at the Ikedaya Incident, and on the same day, Shinsengumi received information that masterless samurai of Choshu clan were hidden in the restaurant Akebono (which was written 明保野 or 曙) in Higashiyama Ward.
1864年6月10日(旧暦)（1864年7月13日）に、幕府の命により池田屋事件の残党の捕縛を命じられた新選組が、同日に東山区の料亭・明保野（あけぼの、曙とも）に長州系浪士が潜伏するとの情報を得た。