This guide details everything you need to know about the new English release of Agent Sirius, its core gameplay mechanics, and how to access its expanded DLC content. Understanding the Product Identifiers
The base game is available for $9.99 USD (approx. 1,200 JPY). The DLC RJ01259073 is listed at on DLsite. Both require a PC running Windows 7, 8, 10, or 11. The price-to-content ratio, especially with the 18 new bestiary entries and the unique NTR storyline, makes it a compelling purchase for fans of the base game.
In the DLC, time looped. He relived the same 73 minutes of the failed mission. Rain on a metal roof. Yuki's voice, calm but breaking: "Sirius, if you're hearing this, I'm already a ghost. The Whisp Collective didn't want our bodies. They wanted our bonds. Our memories of each other. They turned love into a vulnerability. And you… you were my only patch."
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If you are a fan of corruption-focused narratives reminiscent of Lightning Warrior Raidy or Tsugu no Hi , Agent Sirius (RJ388166) is a must-play. While the DLC (RJ01259073) is best experienced after finishing the main game to appreciate the depth of the "NTR" storyline. With the now available for free on Steam, there has never been a better time to dive into the dark mysteries of Star Haven High. eng agent sirius dlc rj388166 rj01259073 new
Based on the search terms provided, here is the information regarding the content:
The search keyword targets the English localized expansion content for Agent Sirius , an indie Japanese role-playing game (JRPG) and mystery adventure developed by Lunarian and published globally by Saikey Studios. The tracking identifiers RJ388166 and RJ01259073 point directly to its specific catalog listings on digital distribution platforms (such as DLsite), where players track original versions, translation patches, and newly released downloadable content (DLC).
📂 RJ388166 & RJ01259073 🌐 Status: English Translated 🗓️ Topic: New DLC / Patch Release
The game is free to claim on Steam if added to your library during promotional periods, making it an accessible entry point for Western audiences. The Steam version contains the same content as the original Japanese version, with potential censorship patches available outside Steam (though not covered by Steam itself). This guide details everything you need to know
This ID directly points to the DLC (Downloadable Content), officially titled (エージェントシリウス DLC/NTR 「裏切りの王国(キングダム)」). It is a direct continuation of the base game's story, but with a sharp thematic shift.
Given the limited availability of official English patches for niche DLsite RPGs, the Steam version has generally been well received, despite some initial modding issues in the original GPT-version fan translation that caused keyword errors and script bugs.
, a popular Japanese digital marketplace for indie games and media. These codes correspond to the game Agent Sirius
The update focuses on "Feature X rollout artifacts, test suites, and canary logs," which suggests a more polished, stable, and possibly more complex investigative experience. It is often described in recent community feedback as a well-designed, engaging, and "new" experience. The DLC RJ01259073 is listed at on DLsite
As more details emerge about this intriguing DLC, one thing is clear: "Agent Sirius" is set to become a memorable chapter in the "Fallout 4" saga, offering both new and veteran players a reason to return to the Commonwealth.
The gaming community is buzzing with the latest content drop for the thrilling mystery RPG, Agent Sirius (developed by Lunarian ), specifically identified through the recently highlighted update codes: . Released in early 2026, Agent Sirius follows Beni Akesuzu, a high school detective club president who also serves as a secret agent defending her school from supernatural monsters.
: The protagonist racing to uncover the truth using her unique gadgets and combat skills. Nadeshiko Shiratora