One day, the shrine maiden of Hakurei Shrine, Reimu Hakurei, spots mysterious pillars towering over various locations throughout Gensokyo. These pillars signaled the start of the Spell Carnival ...

The only gateway between the two worlds is the Hakurei shrine. Reimu Hakurei is the maiden working at said shrine. Whenever problems of supernatural causes occur, Reimu goes out with her friends ...