Not much is known about the Demon Girl of Flowers other than being the reincarnation/ghost of a bottom-heavy girl that died in the late 60s of rape when the hippie era was at the height.
At midnight, when the forests are foggy, you could see a ring of red flowers around two lilacs before the wind whistles and the girl appears. Legend has it that she can sense your thoughts; no matter if they are morbid or perverted.