A young boy named Shinta is saved by Hiko Seijuro and given the name Kenshin. He trains Kenshin in the ways of Hiten Mitsurugi Ryuu, a peerless sword technique. As the civil war in Japan intensifies, young Keshin feels that it is his duty to help save the people. His involvement turns him into the most feared Hitokiri Battousa
Seisouhen can be roughly translated as the passing of years. The story indeed starts many years after Kenshin had put down his sakaba sword and decided to settle down. Other regular characters, such as Yahiko, who has grown into adulthood, also make their appearances.
Kenshin and Kaoru have married and have a son named Kenji. Unfortunately, peace does not last long. Kenshin once again has to answer the call to defend the peace of Japan.
While Kaoru awaits his return, she recalls scenes from her memories: her first meeting with Kenshin, and all of their past adventures. Kaoru waits, and waits, for her beloved Kenshin... but it looks like he might not be return.