Fukami Suguha visits the graves of the Akou rounin on New Year's Day and loses consciousness during a solar eclipse. He wakes up in the body of a same-named samurai in 1701, dropped into the events surrounding the famous forty-seven rounin — historically accurate in almost every detail, except that many of the rounin are women. Suguha must navigate Edo-era life as history takes its course around him.