The Reaper Duke's Substitute Bride

Migawari Kon wa Shi no Kaori? ~Shinigami Koushaku ni Totsuide Mainichi Shiawase desu~, 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～