Touhou Seirensen ~ Undefined Fantastic Object.
アレは何だ？ 鳥か？ 妖精か？ 謎に満ちた未確認幻想物体が、君を未知の世界に誘う！ ファンタスティックでレトロな弾幕シューティング幻想
Last Updated: 10/17/2025
| Steam Price | $14.99 |
| Release Date | 6/6/2020 |
| Developer | 上海アリス幻樂団 |
| Publisher | Mediascape Co., Ltd. |
| Steam App Id | 1100160 |
Touhou Seirensen ~ Undefined Fantastic Object.
アレは何だ？ 鳥か？ 妖精か？ 謎に満ちた未確認幻想物体が、君を未知の世界に誘う！ ファンタスティックでレトロな弾幕シューティング幻想
Last Updated: 10/17/2025
- Windows
- Mac
- Linux
- Steam Deck (Playable)
About Touhou Seirensen ~ Undefined Fantastic Object.
Touhou Seirensen ~ Undefined Fantastic Object. is an Indie, and Action game developed by 上海アリス幻樂団. On 6/6/2020, it was released on the Steam Store by Mediascape Co., Ltd.
It can be played and ran on Windows systems. At the moment, it is possible to play Touhou Seirensen ~ Undefined Fantastic Object. on the Steam Deck but some functionality may not be fully supported.
According to Steam’s category system, Touhou Seirensen ~ Undefined Fantastic Object. supports the following features:
- Single-player
- Steam Cloud
- Family Sharing
From the Steam community, Touhou Seirensen ~ Undefined Fantastic Object. has been tagged with the following user tags:
- Difficult
- Great Soundtrack
- Shoot 'Em Up
- Faith
- Bullet Hell
- Arcade
- Indie
- Anime
- Action
- Female Protagonist
- Singleplayer
- 2D
Media & Sceenshots
Watch the featured video for Touhou Seirensen ~ Undefined Fantastic Object. and see the latest screenshots from the Steam Store.
Related Packages
Touhou Seirensen ~ Undefined Fantastic Object. is referenced by 1 package in the Steam Store. A package (or sub) is simply an item that can be purchased on Steam.
| Name | Price | Actions |
|---|---|---|
| 東方星蓮船 〜 Undefined Fantastic Object. | $14.99 | View |
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Features & Categories
Frequently Asked Questions
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Data is enriched, cleansed, verified, and updated in real-time to ensure we surface the most up-to-date information. Learn more about the Steambase approach to data collection.
Touhou Seirensen ~ Undefined Fantastic Object. data has been sourced from:
- Valve Corporation. (2025, October 17). Touhou Seirensen ~ Undefined Fantastic Object. on Steam. Steam Store.
- Valve Corporation. (2025, October 17). Touhou Seirensen ~ Undefined Fantastic Object.. Steam Community Hub.
- 上海アリス幻樂団. (2023, July 10). Touhou Seirensen ~ Undefined Fantastic Object.. Touhou Seirensen ~ Undefined Fantastic Object..