This article is a BG time-travel article about Ichi-kun in Hakuo Oni.
The heroine is an ordinary high school student living in modern times. She is a masculine woman who occasionally has violent tendencies. On her way home from school, she accidentally enters a different dimension. When she wakes up, she has traveled to the world of Hakuouki. It is the end of the Tokugawa period in Japan's Edo period. It's like that anyway╮(╯▽╰)╭