Oogami Ichirou returns to Japan after having defeated the evil that threatened Paris. Something is once again wrong in the Imperial Capital, as two street cars go berserk without any reason, saved only by the mech-commanding girls of the Hanagumi Brigade. The girls from Paris Kagekidan return to join forces with the original cast, to help Oogami Ichirou to defeat evil one more time. [From [url=http://www.mobygames.com/game/sakura-taisen-4-koi-seyo-otome]MobyGames[/url]]

One year have passed since final battle of first game. During this year Ichiro Oogami was abroad and he returns to Kagekidan in the beginning of the game. Soon new enemies are showed themselves. Kokkikaigogyoushuu (lit. - meeting of five demons) and ther leader - Oniou (lit. - demon king) trying to destroy a peacefull life of Imperial Capital. At the same time two new members joined Kagekidan - ladylike half-Japanese/half-Italian Orihime Soletta and quiet and serious german Reni Milchstrasse. While game progresses it is appeared that Oniou is not a real leader of new enemies but he has his own mystery...

A visual novel set a year after Sakura Taisen 3. A dancer has disappeared at Chatnoir Theatre, and the Japanese detective Akechi Kojirou is tasked with the case. He will be supported by the Hanagumi and his younger sister, Miki.