Yumemi Okazaki (岡崎 夢美 Okazaki Yumemi) is a college professor searching for the mysterious power of magic so that she can study it and bring her findings back to the scientific community. When she arrives in Gensokyo, her ship, the Probability Space Hypervessel, is mistaken for some ordinary ruins by the inhabitants. She attempts to kidnap the heroine to use her as a research subject, but is ultimately defeated and sent home empty-handed. Yumemi is unfamiliar with both the magical and religious matters of Gensokyo, so she refers to Reimu Hakurei's power as magic, even when Reimu insists that it's actually divine power.