Touhou Seirensen ~ Undefined Fantastic Object.
Bullet-hell shooter about pursuing a mysterious ship in the sky
上海アリス幻樂団 · Published by Mediascape Co., Ltd. · Released Jun 5, 2020
- Reviews
- Very Positive
- 96% of 491
- Recent reviews
- Not enough recent
- Players
- 16
- daily peak, Nov 7, 2026
- Steam Deck
- Playable
- Last update on Steam
- 5 years ago
- Jan 21, 2021
What is Touhou Seirensen ~ Undefined Fantastic Object.?
A single-player, 2D bullet-hell shooter set in Gensokyo, where rumors of a mysterious flying ship draw the protagonists after it. Across stages, you shoot enemies, dodge bullets and lasers, collect items, and use limited spell cards to clear incoming fire.
For you if...
- +you enjoy practicing difficult boss patterns
- +you appreciate music in stage-based arcade shooters
Not for you if...
- −you want a shooter with minimal bullet dodging
- −you dislike moving into danger to collect pickups
What players say
96% of 491 reviews are positive
Players praise the music and boss patterns. One player criticizes the color-changing UFO pickups for pushing players into dangerous positions.
Screenshots and trailer
Touhou Seirensen ~ Undefined Fantastic Object. system requirements
Minimum: Shader Model 2.0 compatib…, 1 GB RAM, 0.4 GB of disk space.
As published by the developer.
Can my PC run Touhou Seirensen ~ Undefined Fantastic Object.?
Tell us your graphics card once and every game page will answer this for you.
Set up my PC →Minimum
- OS
- Windows 7/8/10
- Processor
- Core 2 Duo or faster
- Graphics
- Shader Model 2.0 compatible
- Memory
- 1024 MB RAM
- Storage
- 450 MB available space
- DirectX
- Version 9.0c
Recommended
- Memory
- 2048 MB RAM
- Notes
- Controller recommended
Does Touhou Seirensen ~ Undefined Fantastic Object. have co-op or multiplayer?
No: single-player only, no multiplayer modes declared.
Does Touhou Seirensen ~ Undefined Fantastic Object. run on Steam Deck?
Playable Playable: it runs on Steam Deck with some adjustments.
- The launcher or setup tool may need the touchscreen or virtual keyboard
- Some in-game text is small and may be hard to read
- Native resolution not supported
- All functionality is accessible with the default controller configuration
- Default graphics settings perform well on Steam Deck
PC version details
- DRM
- None declared on Steam
- Controller
- Keyboard and mouse
- Platforms
- Windows
- Steam features
- Cloud saves, Family Sharing
- Languages
- Text only: Japanese.
Does Touhou Seirensen ~ Undefined Fantastic Object. use AI-generated content?
No AI-generated content is disclosed on the game's Steam page.
Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 25, 2026. How to filter AI games on Steam
