Ever since Akamine Jun fell down the stairs, everything has changed. Her world, her time and of course, her life. A series of not-so-fortunate events somehow lead her to the infamous Shinsengumi, and unwillingly she stays at the headquarters at the pretense of having amnesia. However, bad things don't just stop here... In fact, they will continue until the day she dies. Prequel of Transferred Into Hakuou!?