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The Hifuu Club (秘封倶楽部 Hifuu Kurabu, lit. Secret Sealing Club) refers to a group in the Outside World with two incarnations at different points in time. Generally, it takes interest in the occult and other worlds.
The Hifuu Club was first introduced in Ghostly Field Club consisting of university students Renko Usami and Maribel Hearn. They are the protagonists in the attached stories of all of ZUN's music albums, with the exception of Dolls in Pseudo Paradise.
The club presents itself as a mere common club for mediums, albeit an incompetent one as they don't participate in the usual occult activities such as ghost summoning or exorcising. However, the true purpose of the club is to seek out and expose the gaps in the boundaries of the world, where it is possible to enter another world.
In Urban Legend in Limbo, it is revealed that a high-school circle known as the Hifuu Club exists in Japan in 2015. Its president is Sumireko Usami, who originally created it as a way to avoid making friends.
This club's activities seem more or less the same as those of the future version.