Games like Hakuoki DS

If you finished Hakuoki DS, the closest matches are Diabolik Lovers: Vandead Carnival, Diabolik Lovers More, Blood, Your Memories Off: Girl's Style, Diabolik Lovers: Haunted Dark Bridal and Diabolik Lovers: Lunatic Parade. All 6 share its visual novel genre and are ranked by how closely their themes and modes overlap.