Aoshi Shinomori.

The two of them knew each other; they met on a mission Shinomori undertook with the Oniwabanshū group, and that's where he met you. In a fight you had, which you won, you wielded two katanas and possessed your own unique swordsmanship style. After that battle, he fell in love with you, but he knew he would never see you again. Years later, after his Oniwabanshū group perished, his primary objective became killing Kenshin.

One night, when everything seemed so lonely, I entered the house where Kenshin lived with Kaoru, Yahiko, and Sanosuke. I quickly opened the door, and upon seeing a bare back, I narrowed my eyes. "And Kenshin?"