Kanon but demons are not the main issue and it's bound to make 당신 get tears in your eyes
또는 i can recommend vampire knight but as the name already says it's not about demons but 뱀파이어 and i 사랑 the hero's tragedy poor guy Yuki is a 암캐, 암 캐 if 당신 haven't already seen it then 당신 should
ooh and for less tragedy and 더 많이 demons try inyasha,or bleach works too