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Agent Sirius

Agent Sirius Game Cover
60%Game Brain Score
Most mentioned positive aspects:story, atmosphere
Most mentioned negative aspects:gameplay, optimization
93% User Score Based on 15 reviews

Platforms

PCSteam DeckWindows
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Agent Sirius Game Cover

About Agent Sirius

Agent Sirius is a single player role playing game with horror, fantasy, mystery, anime and others themes. It was developed by Lunarian and was released on April 10, 2026. It received very 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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Agent Sirius screenshot
Agent Sirius screenshot
Agent Sirius screenshot
Agent Sirius screenshot
Agent Sirius screenshot
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Reviews

93%Audience ScoreBased on 15 reviews
story5 positive mentions
  • Engaging and well-paced narrative with strong character development and memorable cast.
  • Unique detective-focused gameplay emphasizing investigation, exploration, and logical thinking over combat.
  • Distinctive chain-corruption system allowing multiple transformation routes and playable fallen heroines, enhancing replay value.
  • Exploration can feel cumbersome and repetitive due to large school map and limited navigation aids.
  • Combat is minimal and simplistic, serving more as a narrative device than a challenging gameplay element.
  • Niche appeal with mature and corruption-heavy themes that may not suit all players, and lack of full voice acting.

  • story

    23 mentions Positive Neutral Negative
    22% positive mentions, 65% neutral mentions, 13% negative mentions

    Agent Sirius offers a compelling, character-driven supernatural detective story that balances suspense, investigation, and emotional partnerships, with well-developed plot twists that enhance narrative depth. Its branching narrative and alternate routes provide meaningful player choice, emphasizing mystery and exploration over complex combat or RPG mechanics. Overall, the story is engaging, well-written, and recommended for players who enjoy plot-driven adventures with strong character growth.

    • “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.”
    • “This investigative structure creates a satisfying rhythm where exploration and dialogue remain just as important as action, allowing the story to unfold naturally while maintaining a sense of suspense.”
    • “The after story alone took me a little over 2 hours and the main game took me nearly 10 hours to beat and see everything.”
    • “Players expecting extensive character customization or highly tactical battles may find the mechanics relatively straightforward, but the game's priorities clearly center on storytelling, mystery, and exploration rather than deep RPG progression.”
    • “Combat is stripped down to evasion-only — dexterity takes a back seat to reading story choices and branching outcomes.”

  • gameplay

    14 mentions Positive Neutral Negative
    21% positive mentions, 58% neutral mentions, 21% negative mentions

    Agent Sirius offers gameplay focused on detective work and investigation, blending narrative-driven exploration with straightforward combat that serves to complement the mystery-solving experience. While it lacks deep RPG mechanics or complex battles, its smooth, classic style and emphasis on storytelling, atmospheric campus exploration, and branching narratives provide a compelling experience for players interested in supernatural mysteries over action-heavy gameplay.

    • “Developed by Lunarian and published by Saikey Studios, Agent Sirius is a narrative-focused RPG that combines detective work, supernatural mystery, and character-driven storytelling into an adventure that prioritizes investigation over traditional role-playing mechanics.”
    • “Its investigative mechanics, memorable cast, branching narrative, and atmospheric setting come together to create an experience that stands apart from more combat-oriented RPGs.”
    • “Although combat is included, it functions primarily as a complement to the investigative experience instead of dominating the gameplay.”
    • “Players expecting extensive character customization or highly tactical battles may find the mechanics relatively straightforward, as the game's focus is on storytelling, mystery, and exploration rather than deep RPG progression.”
    • “While players seeking fast-paced gameplay or highly elaborate battle systems may find certain aspects limited, those who enjoy solving mysteries, uncovering hidden conspiracies, and following a character-driven supernatural story will likely appreciate what the game has to offer.”
    • “That said, the gameplay itself stays pretty basic and mainly supports the story experience rather than taking the lead.”

  • atmosphere

    5 mentions Positive Neutral Negative
    80% positive mentions, 20% neutral mentions, 0% negative mentions

    The game effectively establishes a compelling and believable school atmosphere that gradually shifts into a tense, unsettling mood, supported by atmospheric background music. Its setting enhances the investigative experience, creating a unique tone that differentiates it from typical combat-focused RPGs.

    • “The premise immediately establishes an intriguing atmosphere, giving players plenty of reasons to uncover the truth hidden behind the school's familiar halls.”
    • “The environments may not push technical boundaries, but they successfully create a believable school atmosphere that gradually transforms into something far more unsettling as the mystery deepens.”
    • “Its investigative mechanics, memorable cast, branching narrative, and atmospheric setting come together to create an experience that stands apart from more combat-oriented RPGs.”

  • character development

    3 mentions Positive Neutral Negative
    100% positive mentions, 0% neutral mentions, 0% negative mentions

    The character development is praised for its natural and satisfying progression, particularly highlighting the red-haired lead. The cohesive CG designs with expressive variations enhance the storytelling, making it a strong point for fans of plot-driven narratives.

    • “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.”
    • “The CG character designs are cohesive with rich expression variants throughout.”

  • graphics

    3 mentions Positive Neutral Negative
    100% positive mentions, 0% neutral mentions, 0% negative mentions

    The graphics feature high-quality 2D anime-style artwork by さなつき, praised for its clean visuals, appealing heroines, extensive character portraits, and multiple variations reflecting different corruption states.

    • “High-quality artwork by さなつき, with 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.”

  • replayability

    2 mentions Positive Neutral Negative
    50% positive mentions, 50% neutral mentions, 0% negative mentions

    The game offers strong replayability, largely driven by player choices that lead to different experiences and outcomes, encouraging multiple playthroughs.

    • “Player choices also contribute to the game's replay value.”

  • music

    2 mentions Positive Neutral Negative
    50% positive mentions, 50% neutral mentions, 0% negative mentions

    The game's music effectively enhances its dialogue-driven storytelling and overall tone, providing an engaging audio experience that runs smoothly even on modest hardware.

    • “Combined with fitting music and an emphasis on dialogue-driven storytelling, the presentation complements the game's overall tone while remaining accessible on modest hardware.”

  • emotional

    1 mentions Positive Neutral Negative
    100% positive mentions, 0% neutral mentions, 0% negative mentions

    The emotional aspect of the game centers on Beni's partnership with Nadeshiko Shiratora, highlighting themes of trust, teamwork, and friendship that offer a heartfelt balance to the darker supernatural elements of the story.

    • “Beni's partnership with Nadeshiko Shiratora serves as the emotional core of the story, providing moments of trust, teamwork, and friendship that balance the darker supernatural themes.”

  • optimization

    1 mentions Positive Neutral Negative
    0% positive mentions, 100% neutral mentions, 0% negative mentions

    The optimization aspect is praised for its high-quality full voice cast, which significantly enhances immersion in the game.

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Play Times

2h Median play time
2h Average play time
2-2h Spent by most gamers
*Based on 1 analyzed playthroughs
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Frequently Asked Questions

Agent Sirius is a role playing game with horror, fantasy, mystery, anime and others themes. Common tags for Agent Sirius include demons, 2d, female protagonist, psychological, choices matter and others.

Agent Sirius is available on PC, Steam Deck and Windows.

On average players spend around 2 hours playing Agent Sirius.

Agent Sirius was released on April 10, 2026.

Agent Sirius was developed by Lunarian.

Agent Sirius has received very 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.

Similar games include Magical Princess Lily, Yuri Blossom!, Immoral office : Hypno Switch, Echoes, GOMA AYAKAZE and others.