Desire Perfume (or The Flowers of Evil) is a unique item in Wonderland which Fran made into a commodity. Anyone who uses it will cause a weird mutation.
This item was used by Yae Sakura. When using it, it causes hallucination and she's instantly forgotten about any bad feeling and may proceed to kill anyone who gets in the way.
Nina is also affected by the hallucination caused by this item, causing her to recognize Emerald's green hair as Yssring.