Games like Doukoku Soshite...

If you finished Doukoku Soshite..., the closest matches are AI: The Somnium Files - Nirvana Initiative, Tiny Bunny, Spirit Hunter: NG, Corpse Party II: Darkness Distortion and Your Turn to Die: Death Game by Majority. All 10 share its adventure genre and are ranked by how closely their themes and modes overlap.