A newly born plant youkai, Ha Seoi, learns to survive in Gensokyo. But soon, plants in her hometown started withering.

Shocked, Ha resolves to heal them; her sister sends her on a quest to Hakurei Shrine to ask the Miko of Paradise for help,

but they are soon attacked by youkai that have been driven insane.

Thus begins an adventure through Gensokyo that has our heroines (and one hero) caught in an ever-growing crisis...