Fran

The fran (フラン), or the love fairies (愛の妖精), are spirits that give shape to unfulfilled love and brings people together. There are as many love fairies as there are broken relationships in the world. They wander in search of their memories and will disappear if they discover their identity before remembering their love.

History
When someone passes away with regrets, even if their source was destroyed and they could never resurrect again, their love fairy will assist them by temporarily lending their bodies to the dead. In exchange, the resurrected person loses the memories of their loved one and will wander in search of those memories. Only those whose love is true would recall their memories and be able to convey their final feelings.

Trivia

 * Information pertaining the Love Fairy Fran is found in the Lilan Volume 771.