“Am I myself a butterfly of night, human of daytime?”
In a not too distant Japan, there is one who dreams of worlds unseen by human eyes. Tired of the stale, creatively sterile world of modernity, she dreams of exotic locales filled with unusual creatures and, surely enough, they become reality. This dreamer is Maribel Hearn.
Maribel is a very curious character as she has never been in an official Touhou game. Instead, she’s the protagonist of a series of music CDs and their attached stories. Along with her friend Renko Usami, Maribel forms the Sealing Club, which is ostensibly a club for spiritual mediums (or in some translations, necromancers), but rather than doing activities associated with either of those terms, they really just go on adventures while investigating supernatural phenomena or otherwise philosophizing.
Maribel possesses the ability to see and interact with the boundaries that separate Modern Japan from realms like the Netherworld, Gensokyo, and the Lunar Capital. This power plays a key role in the events of the Sealing Club stories, beginning with glimpses or fleeting visits to other worlds during her dreams, but developing into something far more potent.