Koihana Bakumeiroku is a romance game developed by CYBIRD x Animate co-production. It is the first title under the new brand +ONE by Ikémen Series.

Set in the Meiji Era after the Boshin War, is a turbulent love story with historical samurai such as "Saito Hajime", "Kido Takayoshi", "Hijikata Toshizo" and others who put their lives on the line.