 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Suicide Girl
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Suicide Girl and Puella Magi Madoka Magica are two magical girl manga aimed for older men, as seen with stuff like mentions of suicide and several characters having tragic backstories. The demons that the magical girls fight in both manga appear quite grotesque and/or otherworldly, and they cause the negative emotions in people to manifest and cause them to kill themselves. Despite the grim atmosphere, the main character's relatively more upbeat attitude shines through, so the story is not completely (and literally) hopeless.