Games like Simple 2000 Series Vol. 98: The Roman Sabou

If you finished Simple 2000 Series Vol. 98: The Roman Sabou, the closest matches are The Ssum, Urakata Hakuoki, Harukanaru Toki no Naka de: Maihitoyo, Hakuoki Kaikoroku and Genrou. All 6 share its visual novel genre and are ranked by how closely their themes and modes overlap.