The Valiant Must Fall Vol. 4 (manga)

After Shino confides in her sister, Enka decides to let Shino go, making it clear she will stop anyone who tries to kill their mother. Shino and Haruyasu go to retrieve the sessho-seki that Shino previously hid, but they discover Shino’s brother, Ikumatsu, has stolen it. When Ikumatsu goes rogue, the government sends a new agent - former Shinsengumi captain Fujita Goro!