Intrigue in the Bakumatsu – Irohanihoheto (Japanese: 幕末機関説 いろはにほへと, Hepburn: Bakumatsu Kikansetsu Irohanihoheto) is a Japanese original net animation series, created by Ryōsuke Takahashi and Sunrise. The series follows Yojiro Akizuki, the bearer of the legendary Moon Tear Sword, who is on a mission to seal a supernatural object known as the Head of the Conqueror, which has now appeared during the Boshin War. Yojiro will not rest until his mission is fulfilled, no matter what or who gets in his way.