Kanon but demons are not the main issue and it's bound to make Ты get tears in your eyes
или i can recommend vampire knight but as the name already says it's not about demons but Вампиры and i Любовь the hero's tragedy poor guy Yuki is a сука if Ты haven't already seen it then Ты should
ooh and for less tragedy and еще demons try inyasha,or bleach works too