| Product Code | Title | Purpose | | :--- | :--- | :--- | | | Agent Sirius (Base Game) | The original Japanese version. Required to run the DLC. | | RJ388166 | Agent Sirius: English Localization DLC | The official translation + extended epilogue patch. |
A: No. You can install the DLC immediately and play from the start in English. The epilogue only unlocks after completing any main ending. eng agent sirius dlc rj388166 rj01259073 new
A: Yes. The DLC does not censor content. All 14 original H-scenes remain, plus 1 new animated scene in the epilogue. All are mosaiced as per Japanese law. | Product Code | Title | Purpose |
The world of adult visual novels and RPG doujin games has seen a sharp rise in high-quality, lore-rich titles over the past few years. Among the standout titles is the original Agent Sirius , a game that captured audiences with its spy-thriller narrative, intricate relationship mechanics, and high-stakes decision-making. However, for English-speaking fans, there has always been a barrier: language. | A: No
A: The developer announced on Ci-en (December 2025) that Version 2.0 is the final update. "New" refers to the DLC’s release status as of early 2026. Final Thoughts The ENG Agent Sirius DLC (RJ388166) is more than just a translation—it is a definitive edition of the game. For the hundreds of players who tried to play RJ01259073 with machine translation and gave up frustrated, this DLC is the key to finally enjoying one of the best spy-themed visual novels of the last five years.
Enter the , cataloged under RJ388166 and RJ01259073 . With the "new" updates rolling out, this long-anticipated localization and expansion pack has finally arrived. But what exactly is included? Is it worth the reinstall? And how do these two product codes work together?