The publisher confirmed the DLC goes live alongside a new trailer showcasing story beats and a major boss encounter.
The Additional Side Story: Rudy focuses on the origins of Rudy, the Royal Felyne, expanding the narrative scope of Monster Hunter Stories 3 by exploring a key character's backstory.
Capcom described the expansion as an opportunity for players to learn more about Rudy's past while engaging with new gameplay content.
The studio also confirmed that players will have the opportunity to challenge the Elder Dragon Nergigante as part of the DLC.
A trailer for the Additional Side Story: Rudy is available now on Capcom's official channels.
The video highlights story scenes, new encounters, and footage of the Nergigante confrontation, giving players a look at the expansion's tone and scale.
Capcom stated that owners of the Monster Hunter Stories 3 Deluxe Edition and Premium Edition will receive immediate access to the Additional Side Story: Rudy.
That automatic entitlement ensures Deluxe and Premium Edition purchasers can jump into the new content without additional purchase steps.
The DLC's platform availability includes Nintendo Switch 2 and other systems that host Monster Hunter Stories 3: Twisted Reflection, with distribution handled through each platform's storefront, including the Nintendo eShop on Nintendo platforms.
Players should consult their platform storefront for download instructions and file-size details.
Monster Hunter Stories is Capcom's turn-based RPG spin-off of the broader Monster Hunter franchise, with multiple entries across Nintendo platforms in the series' history.
Capcom continues to support Monster Hunter Stories 3 with post-launch content following the game's release, expanding narrative options and high-difficulty encounters for series fans.
For players interested in the new expansion, check Capcom's official website and the game's storefront pages for the trailer, platform-specific download instructions, and any patch notes accompanying the DLC release.
Deluxe and Premium Edition owners should verify access through their platform libraries to begin the Additional Side Story: Rudy immediately.