Games like Izumi Jiken File Vol. 1 - Shiosai-hen

If you finished Izumi Jiken File Vol. 1 - Shiosai-hen, the closest matches are AI: The Somnium Files - Nirvana Initiative, Detective Instinct: Farewell, My Beloved, Little Locked Rooms, Are We Thawing and Tantei Jinguji Saburo: Kiken na Futari. All 10 share its visual novel genre and are ranked by how closely their themes and modes overlap.