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 story follows the main protagonist, Reimu Hakurei, the shrine maiden of Hakurei Shrine, as she and her friends resolve these disturbances.

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 ...