Lost Uncrowned King

Jon Constant, was once a bright child. But after a harsh tragedy, he started walking into the torn path. Hundred years had passed, he lived his life hidden through darkness over those times. Thereafter, decided to finally end everything... To eradicate everything he loath for. That's what he thought so, not until the woman in her with her pigtail hair confessed her feelings to him, after he started attending a high school. Would the girl be able to heal the heart of the lost king, Jon?