Games like Himitsu Chouhou Buin: 00Nanako-chan II

If you finished Himitsu Chouhou Buin: 00Nanako-chan II, the closest matches are Artificial Academy 2, Sexy Beach 3, Oppai Slider 2, Artificial Girl 3 and Premium Play Darkness. All 7 share its adventure genre and are ranked by how closely their themes and modes overlap.