Games like Simple 1500 Series Vol. 59: The Suiri - IT Tantei: 18 no Jikenbo

If you finished Simple 1500 Series Vol. 59: The Suiri - IT Tantei: 18 no Jikenbo, the closest matches are Suikoden, Wipeout, Clock Tower II: The Struggle Within, Echo Night 2: Nemuri no Shihaisha and Sanyo Pachinko Paradise 2: Umi Monogatari Special. All 10 share its adventure genre and are ranked by how closely their themes and modes overlap.