End of Edo period, Kyoto.
Hero becomes a part of a newly-formed Shinsengumi unit. He is to protect Kyoto from the evil hands of Kinno (Kyushu) and develop relations with squad female members such as Hijikata and Okita.
Despite the real historical period, events are mostly comical and beyond time limits. For example, heroines often appeal to human rights protection. Depending on the value of real "absurdity" parameter in the game you can get rid of the great devil coming to Kyoto with a 88 mm cannon, cyborgs or panda samurai.

[From vndbreview]