Kill or be killed. Engage in tense duels against fallen warriors with precise Iaido parries. Solve mysteries and face creeping horrors while managing a strange inventory where item pieces become your health. A unique blend of puzzle-action, horror, and parry-counter combat awaits!
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Release Date:
May 20, 2025

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Early Access Game

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Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“This is to receive feedback from our players and release a game that is objectively polished. We can get feedback from you about how you play (reviews, SNS, live broadcasts, etc.), and this will help us improve the quality of our games.”

Approximately how long will this game be in Early Access?

“We plan on doing it for about six months.”

How is the full version planned to differ from the Early Access version?

“The full version is planned to add the following features to the early access version. Please note that these may not necessarily be implemented.

- Ability to visualize the story as a chronological map
- Localization (Simplified Chinese, English planned)
- Controller support
- Key configuration support”

What is the current state of the Early Access version?

“You can play all chapters. Specifically, all features except for the additional features shown in "What are the differences between the Early Access version and the planned full version?" are implemented.”

Will the game be priced differently during and after Early Access?

“We do not plan to change the price even after early access ends.”

How are you planning on involving the Community in your development process?

“Please send us your feedback on social media such as X (formerly Twitter)!”
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About This Game


A Puzzle Adventure Like No Other

In this unique blend of puzzle-solving and horror, every item you collect transforms into a polyomino-shaped piece. Use these pieces creatively: solve intricate puzzles, craft tools, unlock paths, or even sacrifice them in moments of desperation. Adapt your strategy and make the most of your inventory—how you survive is entirely up to you.


Face Undead Warriors with Iaido Precision

Explore a haunted samurai residence, where restless spirits of fallen warriors still roam. Engage in intense one-on-one encounters using finely tuned Iaido sword techniques, timed dodges, and parry counters. Overcome fear through skillful slashes that break the tension and offer moments of exhilarating relief.


A Chilling but Gentle Horror Experience

Rather than relying on jump scares, this game creates a deeply atmospheric horror inspired by traditional Japanese aesthetics. Feel the suspense build as you unravel the mystery, all while enjoying a horror experience designed to thrill—not startle.

Video Posting Guidelines

The video posting guidelines for "虚衝 - Kyosho" stipulate the conditions and prohibitions for posting videos and images using this game to online video distribution sites (including live streaming).

If you post videos and images using this game in accordance with these guidelines, there is no need to contact us individually.

*If you are a corporation or other organization and would like to post videos and images using this game, please contact us via the email address listed on the Mutsu Mutsu Project official website.

  • Please include the name of the game, "虚衝 - Kyosho" or "Kyosho" in the title field of your video post or live stream.

  • Please include the Steam store page URL in the summary or description field of your video post or live stream.

  • Monetization is only possible if you use the monetization methods provided by the designated video sharing site (*1) (ad revenue, super chat, tips, donations, etc.). Monetization in other cases is prohibited.

  • Mutsu'pro(むつむつプロジェクト) is not responsible for any damage or trouble that occurs during video post or live stream.

  • The following content is prohibited from being posted.

    • Anything that violates public order and morals

    • anything that includes religious solicitation

    • anything that significantly damages the value of the game

  • These guidelines are subject to change without notice.

*1: Designated video sharing sites (Youtube, Niconico, Twitch, TwitCasting, TikTok)

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

We use generative AI for some textures, models, and pre-translation for multilingual support.

Mature Content Description

The developers describe the content like this:

This work contains mild blood and animal carcasses.

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows® 10
    • Processor: Intel® Core™ i3 or AMD Ryzen™ 3
    • Memory: 8 GB RAM
    • Graphics: NVIDIA® GeForce® GTX 960
    • DirectX: Version 12
    • Storage: 2 GB available space
    Recommended:
    • Requires a 64-bit processor and operating system
    • OS: Windows® 11
    • Processor: Intel® Core™ i5 or AMD Ryzen™ 5
    • Memory: 16 GB RAM
    • Graphics: NVIDIA® GeForce® RTX 3060
    • Storage: 2 GB available space
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