Akuyaku Ouji no Eiyuutan

Alfred, the third prince of an illustrious royal family, is despised for his dark hair and bruised-looking eyes. When he confronts his older brother, Leolu, the main heir to the throne, Alfred tells his beloved, Charlotte, that he has ended their engagement. Charlotte has been wrongly accused, and Alfred takes her place to save her, believing the matter resolved. His actions begin an unlikely heroic tale about a miserable prince who was once an obscure nobody.