It's a Manga that I've read years ago. The protagonist was once a soldier but died. His wife was secretly a high ranked magician and went on a journey to revive his husband. The exchange for resurrection is her life. So his husband now alive and immortal, but his wife is dead. Now it's the husband turns to go on a journey to resurrect his wife. He carried a coffin that contain his wife skeleton. He find a friend that accompanied him in his adventure (though I forgot the companion gender). Does anyone know what Manga that I've talking about?

Marry Grave

Thanks!