DLC Bundle Ryoma Sakamoto contains the following items:

A set of custom parts, original weapons and new missions. Play as Ryoma Sakamoto. Includes character model, ‘Revolutionary’ clothing set, the Mutsunokami Yoshiyuki sword and Sakamoto’s Wakizashi accessory, all selectable from the game’s onset. Also includes the M2 Revolver, purchasable from the specter in the cemetery.
*Note: You must be proficient with firearms to use the M2 Revolver.