The gigantic young ogres known as "loli oni" rule all of Gensoukyou. The citizens of Gensoukyou construct high walls to fend off their invasion, but when the walls are finally breached, a desperate battle begins. With the destruction of the Hakurei shrine, will Reimu swear vengeance and throw herself into the fray along with her teammates...? This hair-raising, side-splitting, full-length slapstick battle gag work begins now!