My review of Peace Maker, Vol. 1 has been posted over at Manga Life. A teaser:

Set in 1864, Peace Maker is the story of two brothers, Tetsunosuki and Tatsunosuke, who join the Shinsengumi, a group of swordsmen loyal to the shogunate. Tatsu, the elder, just wants to make a good living so he can support himself and his brother, but Tetsu’s driven by a different goal: he’s vowed to avenge his parents, who were killed by a Choshu revolutionary. But when Tetsu joins the Shinsengumi, he must make a difficult choice. Is he willing to become a demon—someone just as ruthless as his parents’ murderer—so he can get his revenge?