Read manga A Substitute Bride to the Reaper Duke Living Happily in the Shadow of Death / 身代わり婚は死の香り？～死神公爵に嫁いで毎日幸せです～
Violetta, a book-loving earl’s daughter, has a twin sister named Virginie who is flashy and charming. Violetta is constantly compared to her sister and shunned by her family as a plain oddball who does nothing but read. One day, as punishment for seducing the engaged Second Prince, Virginie is ordered to marry Richard, the “Grim Reaper Duke”—a man rumored to bring certain death to any woman who becomes his wife. However, to protect his doted-upon Virginie, their father decides to offer Violetta as a substitute instead. With no way to escape the situation, Violetta steels her resolve and marries the “Grim Reaper Duke.” But the Richard she meets turns out to be a true gentleman who protects Violetta whenever her life is in danger. Why is someone so gentle called the “Grim Reaper Duke”…!?