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Probability Space Hypervessel

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可能性空間移動船 (かのうせいくうかんいどうせん)
Probability Space Hypervessel
Inside the Probability Space Hypervessel, as seen in the cutscene before Stage 8 in Phantasmagoria of Dim.Dream.

Yumemi Okazaki?


Unknown, either the Outside World or near the Hakurei Shrine, but it can move

Official Games

The Probability Space Hypervessel (可能性空間移動船 kanōsei kūkan idō sen) is a large ship that Yumemi Okazaki, its captain, and Chiyuri Kitashirakawa, a crew member, used to travel to Gensokyo in search of proving the existence of magic. It's implied that the vessel is quite large, because most of the residents of Gensokyo took it to be ordinary ruins of some sort. It ends up becoming the main location in the events of Phantasmagoria of Dim.Dream.


In the game, Chiyuri secretly handed out pamphlets about a new "Fantasy Ruins" in Gensokyo, where a prize will be given to grant them happiness, but a note outside the ruins said that only one person can enter. Reimu Hakurei, Mima, Marisa Kirisame and others decided to fight each other until that's one winner who's able to enter. The person who enters encounters Chiyuri then Yumemi within and discovers that it is in fact a ship. Once that person defeats the two, they're given a prize as promise. At the end of the game, Yumemi and Chiyuri take this ship back to Outside World, but come back to Gensokyo later because Yumemi was kicked out of the university she was teaching at.

Time Machine Possibility

There's possible statements that support the fact that the giant ship is a time machine and that Yumemi and Chiyuri come from the future (which, combined with them being humans, would imply they come from the future of the Outside World). Chiyuri snaps "Cut it out already! If you do that we'll end up as historic criminals!" when she stops Yumemi from (jokingly) threatening to blow up the planet. Rikako Asakura comments that Yumemi's technology appears to be 5 centuries ahead of Gensokyo's technology (Gensokyo, and thus its technology, was only really fully sealed off from the outside world a century or two ago). Also, Chiyuri's title is "Resident of Fantasy That Runs Through Time".