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Taisei Project

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泰西プロジェクト (たいせいぷろじぇくと)
Taisei Project

v1.0: 9 August 2012
v1.1: 25 September 2017
v1.2: 26 January 2018
v1.3: 27 April 2019
v1.3.1: 29 September 2019
v1.3.2: 2 May 2021


Vertical Danmaku Shooting Game


Single-player story mode


web browser

Official Site


Taisei Project (泰西プロジェクト) is an open-source Touhou Project fangame. Its development was started in 2011 by Laochailan, under the tentative title "OpenTH". Akaricchi, another programmer, became involved with the project starting in 2012, and the game saw its full first release later that year.

After a five-year hiatus, development on Taisei resumed in 2017, during which the project received many more contributors. Since then, the story was rewritten and a full soundtrack was composed, and various other improvements have taken place.


The current build features three playable characters: Reimu Hakurei, Marisa Kirisame and Youmu Konpaku, each with two shots.

Name and Concept

The Japanese word taisei (泰西) literally means "the West" or "the Occident", in a similar vein to the Seihou Project. However, the two series are not related.



Another villain threatens to turn the land of dreams into a place of terror. The barrier is disrupted, and a strange tunnel that leads to an unknown land opens on Youkai Mountain. Gensokyo is thrown into chaos as humans and youkai alike flock to this rift, where they will discover forces both new and old that have changed beyond recognition.

v1.4 (alpha)

Many residents of Youkai Mountain become overwhelmed with maniacal feelings of intellectual superiority, seemingly without warning. Worse yet, it seems to slowly affect others who so much as get close to the Mountain itself. The protagonists are sent to investigate the source of this "madness," lest Gensokyo be thrown into intellectual chaos.


Taisei Project features original music in the style of ZUN, composed by Tuck V and Jneen Collective.

External Links

Official soundtrack