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Agent Sirius is a single player role playing game with horror, fantasy, drama, mystery and others themes. It was developed by Lunarian and was released on April 10, 2026. It received overwhelmingly positive reviews from players.

An uneasy atmosphere grips Star Haven High School. Mysterious incidents targeting girls begin to unfold one after another, and rumors soon spread of things more suited to urban legends. And it is up to Beni Akesuzu as the head of the detective club to get to the bottom of these incidents. But even she has a secret: she’s a secret agent for Bancho, a secret organisation specialising in dealing wi…

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100%
Audience ScoreBased on 10 reviews
story4 positive mentions

  • Engaging story with natural character development and well-built plot twists that keep players hooked.
  • Strong chain-corruption routes with multiple transformation patterns and high-quality artwork featuring many fallen-state variations.
  • Smooth exploration and puzzle gameplay with a good mix of genres; forgiving and simple action segments support narrative and adult content.
  • Gameplay is basic with limited challenge; investigation is somewhat shallow and dodge-based combat mainly serves as a setup for adult scenes.
  • Early game can feel overloaded with characters and information, making it potentially overwhelming.
  • Limited appeal outside niche audience and no full voice acting, which may reduce immersion for some players.
  • story
    12 mentions Positive Neutral Negative

    The story is engaging and well-written, featuring strong character development and unpredictable plot twists that add meaningful depth rather than shock value. It offers multiple routes, including darker endings where characters fall under enemy control, catering especially to fans of corruption themes. Overall, the narrative is captivating and encourages full completion for the best experience.

    • “The story is genuinely engaging from start to finish, packed with unpredictable plot twists that keep you hooked the whole time.”
    • “What makes it even better is that the twists aren’t just there for shock value—they actually add depth to the story and are well-built throughout.”
    • “Lose and the story continues as Beni and others fall under enemy control.”
    • “It unlocks alternate routes where Beni falls under enemy influence, continuing the story with different outcomes and character states.”
    • “If you’re here for corruption and bad ends, it delivers consistently, with the gameplay and story mainly there to support that experience rather than take the lead.”
  • gameplay
    6 mentions Positive Neutral Negative

    The gameplay is straightforward and smooth, blending genres effectively to support a narrative focused on corruption and bad endings. It emphasizes classic old-school mechanics, delivering a consistent and engaging experience without overpowering the story.

    • “Great mix of genres and the gameplay feels smooth.”
    • “Classic oldschool gameplay done right.”
    • “That said, the gameplay itself stays pretty basic.”
    • “If you’re here for corruption and bad ends, it delivers consistently, with the gameplay and story mainly there to support that experience rather than take the lead.”
  • graphics
    3 mentions Positive Neutral Negative

    The graphics feature high-quality 2D anime-style artwork by さなつき, showcasing appealing heroines with extensive character portraits and multiple visual variations tied to different corruption patterns. The clean and detailed art style is highly praised by users.

    • “High-quality artwork by さなつき, featuring appealing heroines, extensive character portraits across a large cast, and multiple visual variations tied to each corruption pattern.”
    • “High-quality さなつき artwork with many fallen-state variations.”
    • “Love the 2D anime art style; it looks very clean.”
  • atmosphere
    2 mentions Positive Neutral Negative

    The atmosphere is enhanced by atmospheric background music, creating an uneasy and tense mood as mysterious incidents unfold at Star Haven High School.

    • “Atmospheric background music included.”
    • “An uneasy atmosphere spreads across Star Haven High School as a series of strange incidents begin targeting female students.”
  • character development
    2 mentions Positive Neutral Negative

    The character development, particularly of the red-haired lead, is praised for feeling natural and satisfying. Users highly recommend the game for its strong and well-executed character growth intertwined with engaging plot twists.

    • “One of the highlights for me is the main character, the red-haired lead, whose character development feels very natural and satisfying.”
    • “Overall, this is highly recommended for anyone who enjoys stories filled with plot twists and strong character development.”
  • music
    1 mentions Positive Neutral Negative

    The music is well-composed and effectively enhances the game's atmosphere, contributing positively to the overall experience. Players appreciate the sound design for its quality and how it complements the gameplay.

  • replayability
    1 mentions Positive Neutral Negative

    The game offers strong replayability, with users highlighting its engaging content and incentives that encourage multiple playthroughs. Overall, players find it rewarding to revisit the game for new experiences and challenges.

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Frequently Asked Questions

Agent Sirius is a role playing game with horror, fantasy, drama, mystery and others themes.

Agent Sirius is available on PC and Windows.

Agent Sirius was released on April 10, 2026.

Agent Sirius was developed by Lunarian.

Agent Sirius has received overwhelmingly positive reviews from players. Most players liked Agent Sirius for its story but disliked it for its gameplay.

Agent Sirius is a single player game.

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