Games like Shall we date?: Null;

If you finished Shall we date?: Null;, the closest matches are Amnesia, Diabolik Lovers: Vandead Carnival, Diabolik Lovers: Haunted Dark Bridal, Puss in Combat Boots and Diabolik Lovers: Lunatic Parade. All 8 share its visual novel genre and are ranked by how closely their themes and modes overlap.