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Video Game / Touhou Seirensen ~ Undefined Fantastic Object

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Touhou Seirensen ~ Undefined Fantastic Object is a video game created by Team Shanghai Alice for Windows computers in 2009. It's the twelfth installment in the Touhou Project franchise.

Reimu Hakurei, Marisa Kirisame, and Sanae Kochiya are investigating a strange flying object in the sky.

The game features the colored UFO mechanic. By collecting saucers of a different color, the player can get more life pieces, bombs, or point bonuses.

The game's official website can be found here (in Japanese).


This game provides examples of:

  • Another Dimension: Stages 5 and 6 take place in Makai, which is a separate dimension from Gensokyo.
  • Breaking the Fourth Wall:
    • Kogasa appears on the disc in an attempt to surprise you. She also does this on the game's Steam page by appearing in one of the preview images.
    • In Sanae's scenario, she mistakes the Power items for secret treasures.
  • Cutting Off the Branches: According to ZUN in a September 2009 interview with Nae Radio, Marisa-B is the canon route because it directly connects to the Extra stage.
  • Flying Saucer: Part of the system involves collecting small UFOs from certain enemies that carry them. Upon collecting a red, blue and green one or three of the same color, a large UFO appears, abducts all items onscreen, and tries to fly offscreen. The saucer drops rewards upon defeat - the loot varies depending on the UFO's color and how much it absorbed.
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  • Game-Breaking Bug: Reaching 1 billion points would up and crash the game. A patch was released to fix this 12 days after release.
  • Heartbeat Soundtrack: The Stage 6 theme, Fires of Hokkai, starts with a heartbeat. Probably counts as a Mythology Gag to the PC-98 games, since ZUN wanted to do the Mystic Square stage 6 theme with heartbeat sounds.
  • If It Swims, It Flies: The Palanquin Ship is a ship that can fly in the air as well as act like a regular boat, and is used by the heroine to travel to Makai.
  • Promoted to Playable: This game marks the first time that Sanae is playable in a Touhou game.
  • Recurring Riff: Stage 6 theme Fires of Hokkai is based on Mystic Square Stage 6 theme World's End.

Alternative Title(s): Touhou Seirensen Unidentified Fantastic Object, Undefined Fantastic Object