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You can stream Peacemaker Kurogane: Belief (2018) on Crunchyroll with a subscription.

Although traumatized by witnessing the murder of his parents by one of the Choushuu, Ichimura Tetsunosuke's thirst for revenge leads him to desire strength. At the age of 15, Tetsunosuke approached the Shinsengumi, wanting to become one of its members. However, Tetsunosuke lacked the skill, mind, and will to emotionlessly cut down whoever threatened peace and the Shinsengumi. Even with the support of his brother Tatsunosuke and his newfound friends of the Shinsengumi, little did Tetsunosuke know the blood and pain he would have to face being part of this historical group.

Blood-soaked streets of the Bakumatsu era provide a volatile backdrop for a teenage boy's relentless pursuit of martial dominance. This animated saga trades traditional heroics for a jagged, vengeful drive to join the Shinsengumi at any cost.