Divine spirits show up in Gensokyo, and our heroines are sent to investigate. They thought the actual culprit was Yuyuko Saigyouji, but Yuyuko says she does not know much about the events and suggest the heroine to go to the Myouren Temple. After battling through various stages to the Hall of Dreams' Great Mausoleum they find that the divine spirits flew here to witness the resurrection of a Saint, Toyosatomimi no Miko. (touhou wiki