Screenshots
Watch trailer on Steam ↗Touhou Koi-Mystery: Legend and Fantasy of Monsters
ZRIGN 地霊研究院 · Published by ZRIGN 地霊研究院
Last updated 27 Sept 2026
Dungeon-crawling Adventure RPG centered around「Dice」. Playing as Koishi Komeiji, a girl who has closed her heart, as she uncovers the mysteries of Gensokyo and seeks love and friendship on her journey. DND-style combines barrage battles – roll the dice unconsciously and claim victory!
Adventure, Indie, RPG, Strategy, Early Access, Casual · More free games
Embark on an adventure as Koishi Komeiji, uncovering secrets of Gensokyo through dungeon crawls and strategic battles. Dive into a casual yet engaging RPG experience with ZRIGN's unique blend of dice rolls and unconscious barrages.
About this game
Touhou Koi-Mystery is a fan-made game based on Touhou Project. It's an action-adventure RPG featuring Komeiji Koishi, a satori youkai who has closed her heart.
Dungeon exploration + equipment building. The combat system is a DND-style experience condensed into just three actions: Move, Attack, and Defend.
It achieves resource management through the offense-defense switch, strategic depth through skill building, and no-damage challenges through an action system.
Explore the mountains and forests of Gensokyo, seeking love and friendship. Encounter a host of characters with unique personalities and abilities – will they become reliable allies or formidable foes?
Forge your own adventure and embark on a journey like no other in this world!
Although dungeon exploration is dark and arduous, this game is still a JRPG at its core. The game's story and atmosphere are lighthearted, cheerful, and relaxing – perfect for casual play after a meal or during your free time. 
Discord：GY4chsGpuW
【Story】
One day, Koishi hears from her sister about the existence of a "cursed poem" that can bring death to anyone who reads it.
Curious and competitive, she makes a bet with her sister: whoever uncovers the truth behind the legend first wins.
Setting out from the Palace of the Earth Spirits, Koishi travels across the entire land of Gensokyo, gathering clues and helping youkai she meets along the way solve their own mysteries. Eventually, she will uncover the whole truth, return to the palace, and honor the promise made with her sister.
Along the journey, you'll encounter all kinds of bizarre legends – and many unique young ladies. Some will be rivals who block your path, others will become friends who lend you a helping hand.
【Game Features】
◆Simple system, low entry barrier – yet with surprising depth
Based on classic "DND-like" and "JRPG" mechanics, the game has been massively streamlined.
Most battles can be won with just "Attack" and "Defend" ! Just empty your mind and unconsciously roll the dice~
An "Instant Auto-Save" system works anywhere, anytime. No need to save manually – every step you take records your progress, so you never have to worry about losing data.
But that's not all –
◆Gorgeous, original-style danmaku meets turn-based action in a unique fusion
During most battle phases, you can use various weapons to catch enemy attacks, nullify damage, and even reflect it back at your foes.
Enemies will unleash the kind of spectacular, signature danmaku Touhou Project is known for – ruthlessly launching attacks that mean instant death if they hit.
You, in turn, can dodge, evade, and parry their barrages, just like in a proper danmaku duel.
If you follow the Spell Card rules and defeat a boss's Spell Card without taking any damage, you'll be rewarded with a Spell Card capture bonus.
◆Rich collection elements for hardcore players
A wide variety of statistics – documenting every little detail of your epic adventure.
Numerous collectible CGs.
Numerous collectible music tracks.
Numerous collectible items.
Numerous enemies and bosses.
◆Faithfully recreated Gensokyo map, richly characterized cast, and a dramatic story
The game features a complete panoramic map of Gensokyo, where a brand new adventure unfolds.
You can visit every corner of Gensokyo, make new friends, challenge different opponents, and trigger unique story events.
As a Touhou Project fan game, many girls appear in this title. Some may look or act differently from their usual portrayals – they come with original outfits and brand‑new personal stories unique to Koi-Mystery.
(And due to budget constraints, some characters can only appear in text descriptions or as background elements – but they're still here in spirit!)
With diverse personalities and abilities, these characters can become either reliable companions or tough adversaries.
Write your own adventure – get to know them along the way, and create a journey that's yours alone!
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10
- Processor: Intel i3-2100 / AMD A8-5600k
- Memory: 8 GB RAM
- Graphics: NVIDIA Geforce GTX 960
- Storage: 3 GB available space
Recommended
- Requires a 64-bit processor and operating system
Supported Languages
Latest news
AnnouncementsOfficial
Adventure Restarts! Touhou Koi-Mystery Game Pilot PV
Today is May 14th – Koishi Komeiji's Day!~I'm the lead of "Zero Research Institute" and the indie game developer "Professor Zero" ~Today, I'm bringing you a lovingly crafted game PV for Koishi – to cheer her on!Please enjoy! 💚冒险再启！东方恋迷踪游戏先导PVIn this pilot PV of Touhou Koi-Mystery, a total of 4 Touhou characters (strictly speaking, 4.5) appear~ Did you spot them all?After several years of changing game engines, recruiting members, relocating our studio, and many other ups and downs, development on Touhou Koi-Mystery has finally returned to the right track.First, I want to apologize to all of you who have been waiting anxiously. Due to limited production capacity, we couldn't prepare a preliminary demo for this year's May 14th (Koishi's Day). Unfortunately, we can't show you Koishi's elegant battle animations just yet.As compensation and as a preview, we made this promo PV instead. After about a year and a half of scrapping and redoing, the game's story has been heavily revised. Almost all script content except for the opening has been completely rewritten. Feel free to speculate: how did Koishi get into a fight with that fairy in the PV? And who is the mysterious person holding the Great Fairy?The gameplay and systems are also very different from before, incorporating inspiration from many other games that the development team has played in recent years. The result is a real-time turn-based combat system.⭐Game Development ProgressOverworld map framework – Complete ✓Galgame-style dialogue framework – Complete ✓RPG party, equipment, and inventory framework – Complete ✓○ Exploration system with temporary in-area growth – In development○ Combat! System – Intensely in development 🔥○ Main story script – Being written○ More Touhou characters appearing – Planned!💚 Future PlansSince many of you are worried about development progress, we plan to resume posting update logs next month. Updates on the combat system and more will follow.We'll continue fixing combat system bugs an...Read full article on Community Announcements (バカ梦美)AnnouncementsOfficial
The game has been released! Come to play with Koishi and other players
{STEAM_CLAN_IMAGE}/42681181/ea1ea1ae921660d6bf63f983a753b71fba5b7d66.png Bilibili: Click here to watch the video "Koishi Navigation: Desktop Youkai", was released free of download on Steam today!！ This is a desktop pet of Komeiji Koishi —— You can put her on the desktop, Feed her Chat with her Daily lottery You can also set up your own unique interactive response and upload it to others Now Free for Download on Steam: https://store.steampowered.com/app/2091250/ In the second half of the year, we will launch a new art book, "Afternoon-Tea Feeding Guide of Koishi" This is a beautiful collection of full-color 50p paintings, and it is also a commemorative album of the 10th anniversary of the founding of ZRIGN (2012-2022) It has collected more than 50 illustrations carefully drawn by Chinese and Japanese painters, such as this and so on. https://store.steampowered.com/app/1609270/ In addition, Touhou Koi-Mystery (official version) will meet you with a new look in 2023, The new engine of unity kernel will be used, and RPGmaker Unite will be completely reset. At that time, you can wait for the new free trial in steam In the same period, Hallui-Sabbat of Koishi will also have a week-long discount ~! https://store.steampowered.com/app/1684100/ Thank you for your support and encouragement~ If you can leave a good comment here, it will be our greatest affirmation and support~ Our Aifadian Channel：@TouHouZRIGN Our Discord Channel ：GY4chsGpuW You can come to us here for more information~ Thank you! The Develops of the DeepRead full article on Community Announcements (幽夢観察者)AnnouncementsOfficial
祝大家五一四恋恋日快乐 Happy 514 Koishi's Day~
一年一度的514恋恋日到啦~ 地霊研究院全作品捆绑包目前正在-51.4%折扣特惠哟~ The annual 514 Koishi's Day is coming~ At present, the whole works bundle of Chirei Kenkyuin are under -51.4% discount~ 庆祝恋恋日 {STEAM_CLAN_IMAGE}/40768177/bb8b0433eb8d794553803462b10a11ae6c0ac428.jpg {STEAM_CLAN_IMAGE}/40768177/e83fba2440a858edf5f3cb08cf62bfe26c5fd4dd.jpg 感谢画师カンパ绘制的《东方恋迷踪》封面服饰恋恋的庭院约会~（个人用） For Koishi's Day Thank the painter カンパ draw the Koishi in the cover dress of "Touhou Koi-Mystery" and the courtyard dating ~ (for personal use) 捆绑包的折扣整个五月都生效哦，希望大家玩得愉快~ The bundle discount will take effect throughout May. I hope you have a good time~ https://store.steampowered.com/bundle/24365/ 希望大家安全地度过5月~ 我们的游戏正稳步开发中，感谢大家的支持 We hope you can spend may safely ~ our game is developing steadily. Thank you for your support~Read full article on Community Announcements (幽夢観察者)AnnouncementsOfficial
According to user feedback, we have modified the main play system of the game
Reminder: this modification will not change any system, plot, existence and event in the game except RPG system A. As we all know, this game is a game that uses dice to move. But in fact, the necessity of using map dice is not high. However, because dice are required to trigger events on some occasions, we cannot delete map dice, so we will optimize the movement of map dice in the official version. (or update demo version when the time is ripe) The number of operations to move with map dice will be reduced by 67% (3 → 1) B. In terms of combat values, the first level of combat dice is too steep, and the combat effectiveness gap between players with one dice and players with two dice is too wide (about 100%), which gradually slows down after that. (50% difference between 2 dice and 3 dice...) Therefore, the slope of the first level combat power step will be reduced by modifying weapons and relics, so as to avoid the combat power drop caused by one dice suddenly becoming two dice. The monster value will be adjusted accordingly, so that the gap between the weakest monsters in the first few areas will not be too wide. C. On whether modifying the playing method will delay the release of the official version of the game. The answer is no, because the release of the official version will be delayed because the painter's drawing is too slow Therefore, while waiting for the painter, I have time to modify the whole playing method of the game. Details are as follows: #★ Foundation #※ UI modification #New novice guidance UI, page turning #The UI of the equipment column is changed to two columns, with head, chest and foot on the left and inventory and reinforcement on the right #Strengthen button optimization. You can see the value of the next level by placing the mouse on the button, and the enhancement order will also be visualized #The property UI will also be beautified #※ label optimization #Relics will have visual tags in the equipment grid (not elsewhere) #※ description op...Read full article on Community Announcements (幽夢観察者)AnnouncementsOfficial
About Cirno Fight
Since many players can't beat the first phase when they first meet Cirno. I will put 5 free items in this place in the complete version, "All Fairy Will Out Light" The effect is that can instantly kill ordinary fairy and one phase of powerful fairy. And drop all the fallen objects of the fairy with a 100% probability This item can be purchased after reaching the magic forest {STEAM_CLAN_IMAGE}/40768177/b7f1099edfd37c09968bc99886cdfdd5de64b7c2.gif Nevertheless, some of the later battles may be more difficult than Cirno. If you don't rely on your own strength to defeat her, the later journey will be more difficult. We will take every user feedback seriously, and welcome to join our discipline channel for discussion: https://discord.gg/GY4chsGpuW Look forward to your more feedback! Developers {STEAM_CLAN_IMAGE}/40768177/a91b2d703ed6c20e89e108fc349e298c78a824ee.jpgRead full article on Community Announcements (幽夢観察者)
