Games like Diamond Girl: An Earnest Education in Love

If you finished Diamond Girl: An Earnest Education in Love, the closest matches are The Amazing Shinsengumi: Heroes in Love, Taisho x Alice Episode 1, The Men of Yoshiwara: Ohgiya, Psychedelica of the Ashen Hawk and Steam Prison. All 8 share its adventure genre and are ranked by how closely their themes and modes overlap.