Soshite Kono Sora ni Kirameku Kimi no Uta XXX

Lumina’s father has died of some disease and the twins, Edios and Michael have died in battle. One day Lumina goes on a scavenger adventure with Pelmo and opens a Pandora’s box. From there comes out a ghost who takes over Pelmo’s body and tells her that he can revive any people who did not die of natural causes. She doesn’t listen to the full rules of the contract and agrees to revive both Michael and Edios. Unfortunately this causes everyone to forget that she’s the Queen or who she is period. Instead Michael becomes King and Lumina finds herself running around the castle hoping for someone to recognize her face.

[Edited from Hinano's Game Babbles]