Intrigue in the Bakumatsu – Irohanihoheto (幕末機関説 いろはにほへと Bakumatsu Kikansetsu Irohanihoheto) is a Japanese anime series created by Ryōsuke Takahashi and Sunrise. It was broadcast between October 6 2006 and April 6 2007 on the Japanese internet streaming channel GyaO.