Luciola's death in Last Exile. Having spent the whole series as an Extreme Doormat, his defiance of Delphine's will for the sake of Dio was truly inspiring. Then he demands that she truly set him free, and she asks what Dio is worth to him just before killing him.
Luciola: He... He is my friend, and I will not betray him.
- It got worse for the viewers once they learned the name of the incredibly heartrending song played during Luciola's flashbacks of his earlier times with Dio, as well as during his death scene: "Lost Friend." This troper cannot listen to that song without crying.